Free Dev Tools

Format, validate, and minify JSON. Highlights syntax errors.

Two-way conversion between JSON and YAML (supports maps, lists, nesting, and scalars).

Convert an array of objects to and from CSV (correctly handles commas, double quotes, and line breaks inside cells).

Two-way JSON ↔ XML conversion. Attributes use @, text content uses #text.

Generate a TypeScript interface from a JSON sample (merges keys, infers types, handles nesting).

Format SQL statements: capitalizes keywords, breaks lines by clause, and indents AND/OR/ON.

Minify JS with Terser (mangle variable names, compress, drop dead code) plus CSS. Options for mangle/compress/ECMA with clear syntax-error reporting.

Parse .env files to and from JSON (supports export prefixes, quotes, and trailing comments).

Generate UUID v4 values (cryptographically secure). Create them in bulk.

Test regular expressions, with highlighted matches and capture groups.

Compare two blocks of text line by line (LCS algorithm).

Compare two texts displayed side by side, line by line (LCS algorithm).

Instantly preview Markdown as HTML (headings, lists, code, links, blockquotes, and more).

Binary / Octal / Decimal / Hex, with a quick conversion tester.

Convert between Unix epoch time and human-readable dates (seconds and milliseconds).

Explains 5-field cron expressions in plain English and lists the next run times.

Escape text into a valid JSON string, or unescape a JSON string back to the original text.

Convert text to 8-bit binary and back (UTF-8).

Convert text to hex code and back (UTF-8).

Calculate Unix permissions: check r/w/x for owner/group/other to get the octal number and rwx notation.

Convert between regular numbers (1-3999) and Roman numerals.

Convert data sizes: decimal (KB/MB/GB, x1000) and binary (KiB/MiB/GiB, x1024).

Format, minify, and validate XML syntax.

Generate Go structs, C#, Java, and Python classes from sample JSON.

Beautify (un-minify) JavaScript, CSS, and HTML code.

Generate fake data — names, emails, phone numbers, addresses — as JSON or CSV.

Compress and decompress gzip/deflate via Base64.

Convert curl commands into Python, JavaScript, Go, or PHP code.

Compare two SQL statements line by line, with differences highlighted.

Compare two JSON documents semantically and list every difference by path.

Check whether JSON is valid against a JSON Schema (draft-07).

Validate YAML syntax and instantly view the matching JSON.

Convert TOML configuration into JSON format instantly.

View CSV files as a table and quickly sort by any column.

Compare two CSV files line by line, with differences highlighted.

Merge multiple CSV files vertically or horizontally in seconds.

Split a CSV file by row count, automatically keeping the header row.

Convert HTML code into clean Markdown while preserving the structure.

Get a detailed, plain-English breakdown of every part of a regex pattern.

Visually build cron expressions with an easy-to-read schedule description in plain English.

Generate a complete docker-compose.yml file from an easy visual form.

Generate a complete Nginx server block configuration from a simple form.

Generate batches of URL-safe NanoIDs with a custom length.

Generate sortable, timestamp-based ULIDs and decode the timestamp from any ULID.

Run a JSONPath expression against JSON and see matching results.

Resolve a value inside JSON using a JSON Pointer (RFC 6901).

Apply a JSON Merge Patch (RFC 7386): null deletes a key, other values merge/overwrite.

Generate a JSON Patch (RFC 6902) that turns a source JSON into a target JSON.

Flatten nested JSON into keys like a.b[0].c.

Rebuild nested JSON from flat keys like a.b[0].c.

Read NDJSON/JSON Lines, combine into an array and flag invalid lines.

Two-way conversion between a JSON array and NDJSON (JSON Lines).

View JSON as a collapsible tree, colored by data type.

Infer the structure and data types of JSON (like a mini JSON Schema).

Sort JSON keys alphabetically (recursively), A→Z or Z→A.

Extract every unique property name in JSON, sorted A→Z.

Convert an array of objects to an object keyed by an id field, and back.

Check whether XML is well-formed and report errors.

Compare two XML documents after normalization — same or different.

Line-by-line diff of two XML documents after pretty-printing.

View XML as a collapsible tree with attributes and text content.

Run an XPath expression against XML and list matching nodes.

Normalize and re-format YAML with consistent indentation.

Compare two YAML documents structurally (normalized + sorted keys).

Semantically compare two YAML: keys added/removed/changed.

Deep-merge two YAML documents (B overrides/extends A), output YAML.

Convert YAML to .properties (flat keys a.b.c=value).

Convert a .properties file (a.b.c=value) to nested YAML.

Normalize and re-format TOML (parse then re-emit).

Format (beautify) HTML with indentation per tag level.

Minify HTML: strip comments and extra whitespace between tags.

Compare two HTML snippets line by line after pretty-printing.

Check HTML tag balance (open/close) and report missing tags.

Generate an HTML table from pasted CSV/TSV data.

Extract a <table> from HTML into CSV.

Convert a <table> (first row = keys) into a JSON array.

Encode & decode HTML entities (&amp; &lt; &#39;…).

Format (beautify) CSS with proper indentation and line breaks.

Minify CSS: remove comments, whitespace and extra semicolons.

Basic CSS check: brace balance, missing semicolons, empty blocks.

Compute the specificity (a,b,c) of a CSS selector.

Generate clamp() for responsive typography/spacing by viewport.

Generate @keyframes + animation properties from parameters.

Generate the transition property from property/duration/timing/delay.

Generate transform (translate/rotate/scale/skew) with live preview.

Generate a CSS triangle using borders — choose direction/size/color.

Generate clip-path from preset shapes (triangle, diamond, hexagon, star…).

Generate filter (blur, brightness, contrast, grayscale…) with preview.

Generate CSS Grid: columns/rows/gap with a live preview.

Experiment with Flexbox: direction/justify/align/wrap + preview.

Build a cubic-bezier() easing function with a curve preview.

Compute the missing dimension for a given aspect ratio.

Generate a consistent z-index scale as CSS variables from a layer list.

Build an SVG <path> from a list of x,y points (polyline) with preview.

Edit SVG code with a live preview and validity check.

Combine multiple SVGs into one <symbol> sprite with <use> usage.

Basic JavaScript formatter: indent by { } and break on ;.

Minify JavaScript with Terser: mangle variable names, compress & drop dead code.

Simple JS obfuscation: escape chars to \xHH/\uXXXX and wrap in eval.

Format (indent) a GraphQL query by brace level.

Build a GraphQL query from operation type, name and field list.

Turn key:value lines into fetch headers and a curl command.

Parse pasted HTTP response headers into a table with notes.

Format a long curl command onto multiple lines, one flag per line.

Generate a Postman Collection v2.1 from METHOD url lines.

List endpoints (path + method) from OpenAPI 3 (JSON or YAML).

List endpoints from Swagger 2.0 / OpenAPI (JSON or YAML).

Generate mock JSON API responses from field:type and record count.

Generate a JSON:API response ({data:{type,id,attributes}}).

Parse a Cookie/Set-Cookie string into a key–value table.

Create a Set-Cookie header with Path/Max-Age/Secure/HttpOnly/SameSite.

Try to decode a session token: JWT payload or base64→JSON/text.

Look up MIME type by file extension (and reverse).

Parse a query string / URL into JSON (repeated keys → arrays).

Send HTTP requests (GET/POST…) from the browser — CORS-enabled APIs only.

Send a GraphQL query (POST) to a CORS-enabled endpoint and view JSON.

Generate a .gitignore from preset stacks (Node, Python, Java…).

Compose a clean commit message and warn on long subject/body.

Generate a Conventional Commit: type(scope): description + breaking.

Bump a SemVer version by major/minor/patch/prerelease.

Group conventional commits into a grouped Markdown changelog.

Create release notes from a version + list of changes.

Generate a starter Dockerfile by stack (Node, Python, Nginx static, Go).

Check a Dockerfile: latest tag, missing USER, apt flags, many RUNs…

Generate a sensible .dockerignore by chosen stack.

Check docker-compose.yml: parse YAML, has services with image/build.

Generate a Deployment + Service pair from name/image/port.

Generate a Kubernetes Deployment manifest.

Generate a Kubernetes Service manifest (ClusterIP/NodePort/LoadBalancer).

Generate a Kubernetes ConfigMap from key=value lines.

Generate a Kubernetes Secret with base64 values from key=value.

Convert flat keys a.b.c=value into nested values.yaml.

Basic nginx syntax check: brace balance, listen/server_name presence.

Generate an Apache <VirtualHost> block from domain and document root.

Check balance of <VirtualHost>/<Directory>… tags in Apache config.

Compare two .env files: missing, extra and differing keys.

Generate a ~/.ssh/config block from host/hostname/user/port/identity.

Parse an SSH public key: algorithm type, comment, string length.

List PEM blocks (BEGIN…END): type, base64 chars, DER bytes.

Generate an RSA 2048 key + CSR (PKCS#10) on-device (node-forge).

Decode an X.509 certificate (PEM): subject, issuer, serial, validity, SAN.

Minify SQL: strip comments (-- and /* */) and extra whitespace.

Basic SQL check: balanced parentheses and quotes.

Build a SELECT from table, columns, where, order, limit.

Generate SQL boilerplate (SELECT/INSERT/UPDATE/DELETE/CREATE) for a table.

Explain a SELECT query in plain words (offline).

Generate INSERT mock data by column name:type (int/name/email/date/bool).

Turn CREATE TABLE statements into an ER diagram (Mermaid erDiagram).

Convert CSV into CREATE TABLE + INSERT statements.

Extract rows from INSERT ... VALUES statements into CSV.

Format (beautify) a MongoDB query/JSON.

Build a find() from field:op:value conditions (eq/gt/lt/ne…).

Decode a 24-hex ObjectId: extract the creation timestamp.

Format SQL: uppercase keywords, break lines by clause.

Build common Redis commands (SET/GET/EXPIRE/HSET/LPUSH…).

Convert time to seconds for EXPIRE and show a readable form.

Generate a Prisma model from a model name + field:type list.

Align field/type columns in the model blocks of a Prisma schema.

Split a connection string (postgres://…) into components.

Create UTM tracking links for Google Analytics: fill in Source/Medium/Campaign... and get a ready-to-copy standard URL.

Generate SEO meta tags (title, description, keywords, robots, viewport) to paste into your <head>.

Generate Open Graph tags (og:title, og:description, og:image, og:url) for Facebook and Zalo.

Generate Twitter Card tags (summary, summary_large_image) so your links display nicely on Twitter/X.

Create a robots.txt file with Allow/Disallow rules, Sitemap declarations, and Crawl-delay for bots.

Generate a sitemap.xml file from a list of URLs, with changefreq, priority, and lastmod set for each URL.

Generate rel=canonical tags to standardize URLs and prevent duplicate content.

Generate hreflang tags for multilingual/multi-region websites, including x-default, to avoid duplicate content.

Check keyword density (1-3 grams) in your content and get warnings for keyword stuffing.

Preview your Google search result snippet (desktop & mobile) and get warned if your title/description gets truncated.

Paste your robots.txt and check whether a URL is blocked or allowed for each bot.

Validate your sitemap.xml file: XML syntax and the url, loc, and lastmod tags.

Generate a <meta name="robots"> tag from index/follow/noarchive… options.

Count meta description length and warn if too short/long for SEO.

Count title tag length and warn against the 50–60 char guideline.

Extract H1–H6 structure from HTML and warn about duplicate H1 or skipped levels.

Check JSON-LD validity & @context/@type presence; list schema types.

Generate FAQPage JSON-LD from a list of question | answer pairs.

Generate Product JSON-LD with price & aggregate rating.

Generate Article JSON-LD (headline, author, date, image).

Generate LocalBusiness JSON-LD (name, address, phone, price range).

Generate Event JSON-LD (name, start date, location).

Generate Review JSON-LD (item, rating, author).

Generate VideoObject JSON-LD (name, description, thumbnail, upload date).

Generate Recipe JSON-LD (name, ingredients, steps).

Generate BreadcrumbList JSON-LD from Name | URL lines.

Generate a sitemap index XML from a list of child sitemap URLs.

Split a large URL list into multiple <urlset> sitemaps by limit.

Extract & check JSON-LD in HTML, list schema types.

Parse robots.txt: group by User-agent, list Allow/Disallow/Sitemap.

Generate Open Graph tags and preview the share card (Facebook/Zalo).

Generate Twitter Card tags and preview the share card on X.

Cluster a keyword list by a shared main word.

Score a page with Lighthouse (perf/SEO/a11y/best-practices) via Google PSI.

View LCP/CLS/TBT/FCP/Speed Index for a page via Google PSI.

Check mobile-friendliness (viewport, font size, tap targets) via Google PSI.

Clean up and format your AI prompts into a standard structure, right on your device.

Estimate the token count of a prompt for GPT and Claude, right on your device.

Validate and format JSON in AI prompts or responses, right on your device.

Strip Markdown formatting and return plain text, right on your device.

Score your AI prompt and get suggestions to improve it, right on your device.

Assemble a structured prompt from role, task, context, format.

A library of useful prompt templates — pick and copy fast.

Compare two prompts: characters, words, estimated tokens.

Line-by-line diff between two prompt versions.

Save & list prompt versions (in your browser).

Shorten a prompt: drop polite filler, collapse whitespace.

Wrap a short prompt with role, constraints and format scaffolding.

Simplify a prompt: split long sentences, drop vague words.

Fill {{var}} placeholders in a prompt template with values.

Compute LLM call cost from in/out price and token counts (custom).

Estimate OpenAI model cost by tokens (reference prices, editable).

Estimate Claude model cost by tokens (reference prices, editable).

Estimate Gemini model cost by tokens (reference prices, editable).

Estimate DeepSeek model cost by tokens (reference prices, editable).

Estimate token count and char/word/token ratios of text.

Estimate tokens & embedding cost for many text chunks.

Compute chunk count from total tokens, chunk size and overlap.

Compute remaining output tokens from context window & prompt.

Explain how temperature affects LLM randomness.

Explain how top-p (nucleus sampling) affects LLM output.

Normalize Markdown from AI output: heading/list spacing, trim extras.

Fix broken JSON from LLMs: strip fences, trailing commas, single quotes, unquoted keys.

Strip "Here is…" preambles, code fences and trailing notes around AI content.

Convert a conversation (role: content) to Markdown or JSON.

Reformat a conversation transcript with dividers between turns.

A collection of role-based prompts — pick and use.

Build a persona system prompt from name, role, tone, rules.

Build a system prompt from goal, constraints and output format.

Build a translation prompt: source/target language, tone, glossary.

Generate SQL from a natural-language request (needs your own OpenAI/Claude key).

Generate a regex from a plain-language description (needs your own key).

Draft an email from a purpose & tone (needs your own key).

Write a cover letter from the role & your experience (needs your own key).

Plan a blog outline from a topic & audience (needs your own key).

Turn raw meeting notes into structured minutes (needs your own key).

Optimize resume bullet points for a target role (needs your own key).

Translate a prompt to another language, preserving intent (needs your own key).

Run a prompt against an LLM and see the result (needs your own key).

Improve a prompt for clarity & effectiveness (needs your own key).

HEX ↔ RGB ↔ HSL, with a live preview.

Convert CSS units px ⇄ rem/em based on the root font size (default 16px).

Extract the dominant color palette from an image (HEX/RGB/HSL).

Create multi-color linear, radial, and conic CSS gradients with a live preview.

Create multi-layer CSS box-shadow effects with a live preview.

Create CSS border-radius for all four corners and elliptical rounding with a live preview.

Create glassmorphism frosted-glass effects using backdrop-filter, with a live preview.

Create neumorphism (soft UI) effects with soft shadows and a live preview.

Check color contrast ratio against WCAG AA/AAA standards.

Browse the Tailwind CSS color palette and quickly copy HEX codes or class names.

Convert CSS into matching Tailwind classes in seconds.

Generate a QR code from text or a URL right on your device (no external service calls). Download as PNG.

Convert images (WebP, GIF, BMP, AVIF, PNG, JPG...) to PNG or JPG right in your browser.

Resize images by pixels or percentage, keep the aspect ratio, and download as PNG/JPG.

Compress images to reduce file size by quality setting or to a target size (KB), and export as JPG/WebP.

Convert PNG/JPG/GIF to WebP for smaller file sizes, adjust quality, and process multiple images.

Strip all metadata (EXIF, GPS/location coordinates, device model) from photos before sharing them. Check whether a photo contains location data.

Extract text from photos/scans using OCR, with support for Vietnamese and English. Images are processed on your device; the language pack is downloaded only once, on first use.

Measure the real-world size of an object from a photo: calibrate using a known reference (2 points) or a 4-corner rectangle (for angled shots, more accurate).

Convert an image to a Base64 string / Data URI to embed directly in HTML/CSS.

Paste a YouTube link to get the video thumbnail in multiple resolutions, including Max Res, to preview and download.

Upload one image and generate a full set of standard-size icons for Web (favicon), iOS, and Android. Download individually or all at once.

Convert HEIC/HEIF photos (iPhone) to JPG or PNG right in your browser, no upload required. Select multiple images.

Optimize and minify SVG files (like SVGO).

Generate EAN-13 and Code 128 barcodes and download them as PNG.

Trim a short video clip into an animated GIF.

Crop an image by selecting the area to keep, then download it as a PNG file.

Rotate images 90/180/270 degrees, flip horizontally or vertically, then download as PNG.

Convert vector SVG images to PNG with a custom resolution.

View an image's EXIF data: camera model, date taken, camera settings, and GPS coordinates.

Flip an image vertically (top–bottom) and download as PNG.

Mirror an image horizontally (left–right) and download as PNG.

Pixelate/mosaic an image with a chosen cell size.

Blur an image (Gaussian) with a chosen radius.

Sharpen an image using a convolution sharpen kernel.

Adjust image brightness by percentage and download.

Adjust image contrast by percentage and download.

Adjust image color saturation by percentage and download.

Rotate the image hue by degrees and download.

Add a colored border around an image (width & color).

Add a decorative double border frame around an image.

Stamp a diagonal faded text watermark onto an image.

Add text/caption onto an image with size, color and position.

Add a caption bar below an image.

Remove all metadata (EXIF/GPS) by redrawing the image; download a clean copy.

Plot the color (R/G/B) distribution of an image.

Extract an image's dominant colors with hex codes.

Click anywhere on an image to get the hex/RGB color there.

Split an image into a rows × cols grid; download each tile.

Merge multiple images into one, horizontally or vertically.

Create a grid collage from multiple images (uniform cells).

Convert any image to 24-bit BMP and download.

Pack icons into a sprite sheet + generate CSS background-position.

Create a thumbnail contact sheet from multiple images with filenames.

Read DPI (pixel density) from PNG/JPEG metadata.

Set a PNG's DPI by writing the pHYs chunk (pixels unchanged).

Detect the real image format by magic bytes (not the extension).

Find duplicate/near-identical images via average-hash (aHash).

Blur faces/sensitive regions by dragging to select an area (manual).

Split an animated GIF into individual PNG frames (gifuct-js).

Convert a YouTube link into an MP3 (embeds cover art + title). Pick 128/192/320 kbps.

Download YouTube videos as MP4 (choose 360p–1080p). Processed right on your machine via the DevBox Local Helper.

Convert video & audio formats (MP4, MKV, MOV, WebM, GIF, MP3, WAV…) with ffmpeg, running on your own machine.

Download/convert many YouTube links at once to MP3 or MP4, with per-link progress and a one-click .zip of everything.

Turn a script into a video: each scene gets an image or gradient background + AI narration (edge-tts) + captions. Runs in a Studio on your own machine.

Compress, trim, merge, watermark and extract frames from video with ffmpeg — runs on your machine, no watermark.

Auto-generate .srt subtitles, transcribe video/audio to text, or burn subtitles into video with Whisper.

Remove image backgrounds in bulk with AI (rembg): export transparent PNG or replace with a solid color.

Download TikTok videos to MP4/MP3 in bulk with progress. Runs on your machine via DevBox Local Studio.

Download Instagram videos & Reels to MP4/MP3 in bulk. Runs on your machine via DevBox Local Studio.

Download Facebook videos to MP4/MP3 in bulk with progress. Runs on your machine via DevBox Local Studio.

Decode the header and payload of a JSON Web Token. Warns about expiration. Does not verify the signature (offline).

Verify a JWT's HMAC-SHA256 signature using your secret — locally, so the secret never leaves your browser.

Create and sign a JWT with HMAC-SHA256 — handy for generating test tokens. Signing happens locally.

Compute SHA-1/256/384/512 hashes using the Web Crypto API, entirely on your device.

Encode/decode Base64 with full UTF-8 support (works correctly with any language).

Generate strong passwords and secret tokens (API keys, NEWS_INGEST_TOKEN, etc.) using secure crypto — nothing leaves your browser.

Compute the MD5 checksum of text (pure JS implementation, since Web Crypto doesn't support MD5).

Encrypt/decrypt text using AES-256-GCM with a password (PBKDF2), right on your device.

Hash and verify bcrypt ($2a/$2b) passwords right in your browser.

Generate an RSA public/private key pair (PEM) locally using the Web Crypto API.

Generate HMAC SHA-1/256/384/512 codes with a secret key using Web Crypto, locally in your browser.

Check your password strength: entropy and estimated crack time — all locally on your device.

Compare two hashes or verify text against a hash — safely, right on your device.

Calculate a CRC32 checksum (in hex and decimal) right on your device.

Encrypt text with AES-256-GCM using a password (PBKDF2), on-device.

Decrypt the base64 produced by AES Encrypt (AES-256-GCM + password).

Encrypt/decrypt a file with AES-256-GCM + password, download on-device.

Generate a random salt via CSPRNG (hex/base64), custom length.

Generate a random key/token via CSPRNG (hex/base64), custom length.

Generate strong passwords via CSPRNG with character-set options.

Guess the hash type (MD5/SHA/bcrypt…) from length and format.

Compute SHA-1/256/512 checksum of a file on-device (Web Crypto).

Compute SHA-1 of text with Web Crypto (on-device).

Compute SHA-512 of text with Web Crypto (on-device).

View text as a hex dump: offset | 16 hex bytes | ASCII.

View each character of text as 8-bit binary.

Read a JWT's exp/nbf/iat claims and tell if it's valid or expired.

Decode & view all claims in a JWT payload (no signature check).

Encrypt/decrypt text with DES using a passphrase (crypto-js).

Encrypt/decrypt text with Triple DES (3DES) using a passphrase.

Encrypt/decrypt text with Blowfish using a passphrase (crypto-js).

Compute the RIPEMD-160 hash of text (crypto-js).

Check if a password is breached (HaveIBeenPwned) via k-anonymity — password never leaves your device.

View an X.509 certificate summary (PEM): issued to/by, days left, SAN.

Calculate an IPv4 subnet from CIDR: network, broadcast, host range, netmask, and host count.

Parse a User-Agent string to identify the operating system, browser, and device.

Look up DNS records (A, AAAA, MX, TXT, CNAME, NS...) via DNS-over-HTTPS.

Look up domain and IP registration info via RDAP.

See your public IP address along with its location (GeoIP).

Send HTTP requests (GET/POST/PUT...) like a mini Postman.

Look up the reverse domain (PTR record) for an IP address via DNS-over-HTTPS.

Compute total addresses and CIDR blocks covering an IP range.

Merge overlapping/adjacent CIDRs into a minimal set.

Split a CIDR into smaller subnets by a new prefix.

Normalize a MAC, extract the OUI and analyze unicast/multicast & U/L bits.

Look up the manufacturer by OUI (offline sample data, partial).

Look up a domain's MX (mail server) records via DNS-over-HTTPS.

Look up a domain's TXT records via DNS-over-HTTPS.

Find & analyze a domain's SPF (v=spf1) record.

Look up a DKIM record at selector._domainkey.domain via DoH.

Look up & analyze a domain's DMARC record at _dmarc.domain.

Look up an IP's ASN via Team Cymru (origin.asn.cymru.com) over DoH.

Look up an IP's PTR (reverse DNS) record via DoH.

Look up registration date & compute domain age via RDAP (rdap.org).

Check if a domain has DNSSEC (AD flag + DNSKEY) via DoH.

camelCase, snake_case, kebab, CONSTANT, Title Case, PascalCase…

Encode/decode URLs and parse query strings into a table.

Generate Lorem Ipsum placeholder text by paragraph or sentence count for design mockups.

Count characters, words, sentences, paragraphs, and lines, plus estimated reading time — updates live as you type.

Convert a title into a URL slug: strip accents, lowercase, and join words with hyphens.

Sort, deduplicate, reverse, trim, remove blank lines, shuffle — process line-based lists.

Encode/decode HTML entities (&amp; &lt; ...). Prevents XSS when embedding text into HTML.

Enter a keyword and get ~30 suggested hashtags for TikTok, Instagram, and Facebook. Copy with one tap.

Reverse text by character, by word, or by line order.

Generate random text, character strings, and numbers with a custom length and count.

Remove duplicate lines, keeping the first occurrence order.

Remove fully empty lines from text.

Remove blank or whitespace-only lines.

Sort lines alphabetically A→Z or Z→A.

Randomly shuffle the order of lines.

Pick N random lines from a list, no repeats.

Count characters, words, lines, code points and UTF-8 bytes live.

Count how often each character appears.

Frequency of letters a–z with percentages.

See code point U+XXXX, decimal & UTF-8 for each character.

Detect hidden characters (zero-width, NBSP, BOM…) and clean them.

Popular emoji palette — click to copy.

Remove all emoji from text, keeping letters intact.

Count emojis and list unique ones with counts.

Repeat a piece of text N times with a custom separator.

Collapse extra spaces, trim lines, merge blank lines.

Trim leading/trailing whitespace on each line.

Reveal hidden whitespace: space ·, tab →, newline ¶.

Find & replace text, with case-sensitivity and regex support.

Detect naming case: camelCase, snake_case, kebab, Pascal…

Count sentences, words and characters in a passage.

Count paragraphs (blank-line separated), lines and words.

Estimate reading time from word count and speed (WPM).

Compute Flesch Reading Ease & Flesch–Kincaid Grade.

Extractive summary: pick the most important sentences (offline).

Compare two texts line by line, highlighting additions/removals.

Check if a string is a palindrome (ignores case, spaces, punctuation).

Check whether two strings are anagrams of each other.

Translate text ↔ Morse code (letters, digits, punctuation).

Convert text to Unicode Braille (grade 1).

Split each PDF page into a PNG/JPG image, choose the resolution, and download individual pages or all of them. No upload required.

Merge multiple PDFs into one, split or delete pages by range, and rotate pages. 100% on your device, no upload.

Combine multiple images or camera captures into a single PDF file: document scan filters, drag-and-drop reordering, A4/Letter paper size, and file compression.

Convert a Word file (.docx) to PDF right in your browser, no uploads needed.

Extract text from a PDF into a Word file (.doc). Text only — layout is not preserved.

Rotate all PDF pages 90/180/270° and download (pdf-lib).

Remove pages by range (e.g. 1-3,5) from a PDF.

Extract pages by range (e.g. 1-3,5) into a new PDF.

Add page numbers to the footer of a PDF (bottom-center).

Stamp a diagonal faded text watermark on every PDF page.

Stamp a text signature into the bottom-right of a PDF page (image stamp).

View & edit PDF metadata (title, author, subject, keywords).

Crop PDF margins by setting the CropBox per edge.

Scale PDF pages up/down by percentage (content included).

Compress a PDF via object streams + metadata removal (modest).

Optimize PDF structure (object streams) to reduce size.

Flatten PDF form fields into static content.

Remove owner restrictions (print/copy) by re-saving the PDF.

Extract all text from a PDF via pdf.js (no layout).

Compare the text content of two PDFs line by line.

Merge multiple PDFs into one and set the merged file's metadata.

View a PDF in the browser (pages rendered with pdf.js).

OCR text from scanned PDFs via pdf.js + Tesseract.

Calculate selling price from cost price using markup or margin, or analyze profit when you know both the cost and selling price.

Calculate the price after a percentage discount and the amount saved, or work out the discount % from the original and final price.

Add VAT to an amount or extract it (8%/10%): get the tax amount and the total/pre-tax price.

Calculate the monthly payment, total interest, total amount due, and repayment (annuity) schedule for a loan or installment plan.

Calculate the future value of savings or investments with recurring contributions, compounded over time.

Convert between Gross and Net salary based on Vietnam's mandatory social/health/unemployment insurance (BHXH/BHYT/BHTN) and progressive personal income tax.

Calculate the break-even quantity and revenue from fixed costs, selling price, and variable cost per unit.

Split a bill evenly among several people, add a tip percentage, and get the amount each person owes.

X% of Y, what percent X is of Y, and the percentage change from A to B.

Convert and check exchange rates for ~160 currencies (USD, EUR, JPY, VND...) using live, up-to-date rates.

Check Bitcoin, Ethereum, and other prices in USD/VND with 24h change, and calculate profit/loss on your position. Data from CoinGecko.

Trade profit/loss (including fees), average cost basis (DCA), position sizing by % risk, and risk:reward ratio. For stocks and crypto.

Create invoices with your details, line items, and taxes, then print or save them as a PDF.

Calculate BMI, BMR, and TDEE (daily calorie needs) from your height, weight, age, and activity level.

Enter your birth date to get your exact age in years/months/days, total days and hours lived, and a countdown to your next birthday.

Enter a list of names or prizes and spin the wheel for a fair random pick. Great for raffles, mini-games, and dividing tasks.

A Pomodoro timer for focused work sessions and breaks.

A stopwatch and countdown timer.