Every tool you need, one keystroke away.
23 fast, free utilities for developers and the web. No sign-up, and nothing you paste ever leaves your browser.
Most popular
JSON FormatterFormat, validate and minify JSON with precise error locations.DeveloperJWT DecoderDecode a JSON Web Token and inspect its header, payload and expiry.DeveloperBase64 Encoder / DecoderEncode text to Base64 or decode it back, with full Unicode support.DeveloperUUID GeneratorGenerate cryptographically random UUID v4 and time-sortable UUID v7 identifiers.DeveloperHash GeneratorGenerate MD5, SHA-1, SHA-256 and SHA-512 hashes from text or a file.DeveloperTimestamp ConverterConvert between Unix timestamps and human-readable dates, in either direction.Developer
Browse by category
Developer11Format, decode, convert and inspect the things you work with every day.Text5Count, convert, compare and clean up text.Image & File6Convert, compress and resize images without uploading them anywhere.URL1Shorten links, generate QR codes, encode and decode URLs.
SoonCalculatorsEveryday maths: percentages, dates, loans and tax.
SoonSEO & WebMeta tags, previews, robots.txt and sitemap helpers.
SoonAIPlain-English explanations for SQL, regex, tokens and errors.
Recently added
JSON ValidatorCheck whether JSON is valid, with the exact line and column of any error.DeveloperURL Encoder / DecoderPercent-encode or decode text and full URLs for safe use in links and queries.DeveloperRegex TesterTest a regular expression against sample text with live match highlighting.DeveloperPopularMarkdown PreviewWrite Markdown and see the rendered HTML side by side, live.Developer
Why Toolsel
Your data stays put
Nearly every tool runs entirely in your browser. Paste an API response or drop in a screenshot — it is processed on your device and never uploaded.
No account, no limits
No sign-up wall, no trial, no daily quota. Open a tool, do the job, close the tab. Everything is free and everything works on the first visit.
Built to be fast
Every page is pre-rendered and ships only the code its tool needs. No spinners between you and the thing you came to do.
Common questions
Are these tools really free?
Yes — every tool, with no account, no trial and no usage cap. There is nothing held back behind a paywall.
Do my files or text get uploaded?
Not for browser-side tools, which is nearly all of them. Those pages carry a “Runs in your browser” badge, and the data you enter is processed by JavaScript on your own device. Anything that does need a server will say so plainly on its own page.
Do I need to install anything?
No. Everything runs in the browser you already have. There is no extension, no CLI and no desktop app to install.
Can I use these tools for commercial work?
Yes. Output you produce is yours, with no attribution required. The terms of use cover the details.