# All the developer tools, in one place. Free. Open source. > Free, open source developer tools that run in your browser: diff checker, JSON diff, formatter, validator, JSON to CSV and YAML, and a viewer. No uploads. Canonical: https://toolspace.tech/ Last updated: 2026-10-25 No login, no sign-up, no uploads, no limits. ## Popular tools - [Diff checker](https://toolspace.tech/diff-checker/) - Compare two texts or files, line by line and word by word. - [JSON formatter](https://toolspace.tech/json-formatter/) - Beautify or minify JSON, with sorted keys if you like. - [Base64 encoder](https://toolspace.tech/base64-encode-decode/) - Encode and decode Base64 text and files. - [QR code generator](https://toolspace.tech/qr-code-generator/) - Make QR codes for links, Wi-Fi and text; PNG or SVG. - [Word counter](https://toolspace.tech/word-counter/) - Count words, characters, sentences and reading time. - [Password generator](https://toolspace.tech/password-generator/) - Generate strong random passwords, made in your browser. ## All tools ### Compare - [Diff checker](https://toolspace.tech/diff-checker/) - Compare two texts or files, line by line and word by word. - [JSON diff](https://toolspace.tech/json-diff/) - Compare two JSON files, ignoring key order and formatting. ### JSON - [JSON formatter](https://toolspace.tech/json-formatter/) - Beautify or minify JSON, with sorted keys if you like. - [JSON validator](https://toolspace.tech/json-validator/) - Check JSON syntax and see exactly where it breaks. - [JSON to CSV](https://toolspace.tech/json-to-csv/) - Turn a JSON array into a spreadsheet-ready CSV file. - [JSON to YAML](https://toolspace.tech/json-to-yaml/) - Convert JSON into clean, valid YAML. - [JSON viewer](https://toolspace.tech/json-viewer/) - Explore JSON as a collapsible tree and copy paths. - [JSON to TypeScript](https://toolspace.tech/json-to-typescript/) - TypeScript interfaces or Zod from JSON. - [YAML validator](https://toolspace.tech/yaml-validator/) - Check YAML syntax and see where it breaks. - [JSONPath tester](https://toolspace.tech/jsonpath-tester/) - Query JSON with JSONPath and see matches. ### Encode - [Base64 encoder](https://toolspace.tech/base64-encode-decode/) - Encode and decode Base64 text and files. - [Timestamp converter](https://toolspace.tech/unix-timestamp-converter/) - Convert Unix epoch time to dates and back. - [JWT decoder](https://toolspace.tech/jwt-decoder/) - Decode JWTs, check expiry and verify signatures. - [URL encoder](https://toolspace.tech/url-encoder-decoder/) - Percent-encode and decode URLs and query strings. - [Hash generator](https://toolspace.tech/hash-generator/) - MD5 and SHA hashes of text or files. - [Number base converter](https://toolspace.tech/number-base-converter/) - Binary, octal, decimal and hex, both ways. - [HTML entity encoder](https://toolspace.tech/html-entity-encoder/) - Escape and unescape HTML entities. ### Text - [Word counter](https://toolspace.tech/word-counter/) - Count words, characters, sentences and reading time. - [Case converter](https://toolspace.tech/case-converter/) - Change text to upper, lower, title, camel or snake case. - [Title case](https://toolspace.tech/title-case-converter/) - Capitalize titles in AP, Chicago, APA or MLA style. - [Lorem ipsum](https://toolspace.tech/lorem-ipsum-generator/) - Generate placeholder text by paragraph, sentence or word. - [Line cleaner](https://toolspace.tech/line-cleaner/) - Dedupe, sort and trim lists of lines. - [Slug generator](https://toolspace.tech/slug-generator/) - Turn titles into clean URL slugs. - [List to SQL IN](https://toolspace.tech/list-to-sql-in/) - Lines to SQL IN lists and comma lists. - [Email extractor](https://toolspace.tech/email-extractor/) - Pull email addresses out of any text. ### Generate - [QR code generator](https://toolspace.tech/qr-code-generator/) - Make QR codes for links, Wi-Fi and text; PNG or SVG. - [Password generator](https://toolspace.tech/password-generator/) - Generate strong random passwords, made in your browser. - [UUID generator](https://toolspace.tech/uuid-generator/) - Generate UUIDs and GUIDs in bulk, v4 or v7. - [Mock data generator](https://toolspace.tech/mock-data-generator/) - Fake JSON test data with chosen fields. ### Design - [Color converter](https://toolspace.tech/color-converter/) - Convert HEX, RGB, HSL; contrast, tints and palettes. - [CSS gradient](https://toolspace.tech/css-gradient-generator/) - Build linear, radial and conic CSS gradients. - [Color palette generator](https://toolspace.tech/color-palette-generator/) - Build palettes from one color, copy as CSS. - [Contrast checker](https://toolspace.tech/color-contrast-checker/) - Text and background contrast against WCAG. - [Aspect ratio calculator](https://toolspace.tech/aspect-ratio-calculator/) - Ratios and missing sides, like 16:9. - [PX to REM converter](https://toolspace.tech/px-to-rem/) - Pixels to rem and back, any base size. ### Image - [Image compressor](https://toolspace.tech/image-compressor/) - Shrink images without uploading them. - [Image resizer](https://toolspace.tech/image-resizer/) - Resize images to exact dimensions. - [Favicon generator](https://toolspace.tech/favicon-generator/) - Favicon.ico and app icons from one image. - [SVG optimizer](https://toolspace.tech/svg-optimizer/) - Clean up and minify SVG files. ### Web - [Meta tag generator](https://toolspace.tech/meta-tag-generator/) - Title, description and social meta tags. - [Robots.txt generator](https://toolspace.tech/robots-txt-generator/) - Build and test a robots.txt file. - [HTTP status codes](https://toolspace.tech/http-status-codes/) - What each HTTP status code means. - [Subnet calculator](https://toolspace.tech/subnet-calculator/) - IPv4 CIDR ranges, masks and hosts. - [User agent parser](https://toolspace.tech/user-agent-parser/) - Read browser, OS and device from a UA string. ### Code - [Code beautifier](https://toolspace.tech/code-beautifier/) - Format Python, Java, C++, C#, Go, JS, PHP and more. - [Regex tester](https://toolspace.tech/regex-tester/) - Test regular expressions with live matches and groups. - [Markdown preview](https://toolspace.tech/markdown-preview/) - Write Markdown and see it rendered live. - [Cron generator](https://toolspace.tech/cron-generator/) - Build or explain cron schedules, see next runs. - [Chmod calculator](https://toolspace.tech/chmod-calculator/) - Unix permissions as octal and rwx. ### Formatters - [SQL formatter](https://toolspace.tech/sql-formatter/) - Format and indent SQL queries. - [Python formatter](https://toolspace.tech/python-formatter/) - Format Python in the Black style. - [JavaScript beautifier](https://toolspace.tech/javascript-beautifier/) - Format JavaScript with Prettier. - [Java beautifier](https://toolspace.tech/java-beautifier/) - Format and indent Java code. - [HTML beautifier](https://toolspace.tech/html-beautifier/) - Format and indent HTML. - [CSS beautifier](https://toolspace.tech/css-beautifier/) - Format or minify CSS. - [XML formatter](https://toolspace.tech/xml-formatter/) - Format XML and check it is well-formed. ## Why toolspace - **Nothing is uploaded.** Every tool runs in your browser. Your data never leaves this tab. - **No sign-up, no limits.** No accounts, no daily caps, no "pro" plan. Use anything as often as you like. - **Open source.** MIT licensed. Read the code, run it yourself, or help improve it. ## Featured on - [CodeHype](https://www.codehype.ai/product/toolspace?utm_source=codehype_badge) - [ScrollLaunch](https://www.scrolllaunch.com/products/toolspace?ref=badge) - [DevHunt](https://devhunt.org/tool/toolspace) - [FindAlternate](https://www.findalternate.com/toolspace) - [Startup Benchmarks](https://startupbenchmarks.com/product/toolspace) - [Million Dot Homepage](https://milliondothomepage.com/product/toolspace) - [ShinyLaunch](https://shinylaunch.com/product/toolspace) - [LaunchClash](https://launchclash.com/product/toolspace) - [Startup Fast](https://startupfa.st) - [DeepLaunch](https://deeplaunch.io) ## Related - [About](https://toolspace.tech/about/) - [Contact](https://toolspace.tech/contact/) - [Comparing JSON files](https://toolspace.tech/guides/compare-json-files/) - [JSON to CSV for Excel](https://toolspace.tech/guides/json-to-csv-excel/)