Free tools that run in your browser

Change case, sort lines, strip duplicates and count words and characters.

Test a regular expression against sample text and inspect every match and group.

Convert between camelCase, snake_case, kebab-case and four more, with every format shown at once.

Count words, characters, sentences and paragraphs, with reading and speaking time.

Generate a linked table of contents from Markdown headings, with GitHub-style anchors.

Build a Markdown table from pasted rows, with aligned pipes and column alignment.

Pull every link out of a document, deduplicate them and strip tracking parameters.

Generate placeholder paragraphs, sentences or words — classic or randomised. Nothing to configure beyond a count.

Pretty-print, minify and validate JSON in your browser. Nothing is uploaded, no signup.

Encode text to Base64 or decode it back, entirely in your browser.

Convert between Unix epoch seconds and readable dates, in UTC or your own zone.

Convert a JSON array to newline-delimited JSON and back, with errors reported per line.

Convert CSV to a JSON array and back, with quoted fields, custom delimiters and optional type conversion.

Compare two JSON documents by path and see exactly what was added, removed or changed.

Convert XML to JSON and back, with attributes and text content handled explicitly.

Convert length, weight, temperature, data size and speed instantly — SI and binary units included.

Compare two texts line by line — additions in green, removals in red. Runs entirely in your browser.

Percent-encode query strings and paths, or read an encoded URL back.

MD5, SHA-1, SHA-256 and SHA-512 checksums for any text, computed locally.

Read the header and payload of a JSON Web Token without sending it anywhere.

Turn a copied cURL command into a fetch() call, headers and body included.

Generate UUID v4 ids, random passwords and API-key-shaped strings from your own device's entropy.

Convert between binary, octal, decimal and hexadecimal exactly, at any integer size.

Read and explain a cron expression, with the next scheduled runs in your timezone.

Break a URL into protocol, host, path and parameters, edit them, and rebuild the link.

Turn a JSON sample into TypeScript types, with nested interfaces and optional fields marked.

Create strong random passwords in your browser — length, character sets and a look-alike filter. Generated locally with crypto.getRandomValues.

Design CSS box shadows visually — offsets, blur, spread, colour and inset — and copy production-ready CSS.

Shrink a photo to a size limit you choose, in your browser. Nothing is uploaded.

Change an image's dimensions without uploading it, with the ratio locked if you want.

Convert between PNG, JPEG and WebP in the browser, with no upload.

Crop an image to a fixed ratio or a free selection, without uploading it.

Stamp text onto an image in your browser, positioned or tiled across the frame.

Brightness, contrast, saturation, blur, sepia and sharpen — applied in your browser.

Encode an image to a Base64 data URI, or decode one back to a viewable image. Files never leave your browser.

Convert between HEX, RGB, HSL and CMYK, and see the WCAG contrast ratio on white and black.

Work out the missing width or height for any aspect ratio, with common presets from 16:9 to 9:16.

Cut the background out of a photo in your browser. No upload, no signup, no watermark.

Turn model output into plain text — drops the asterisks, hashes and backticks before you paste it into an email or a chat.

Mask emails, phone numbers, card numbers and API keys before you paste text into a model.

Estimate how many tokens a prompt or document will cost, and how much of a context window it fills.