Every developer has bookmarked a JSON formatter, a regex tester, a JWT decoder, or a base64 converter at some point. And every one of those tools logs the input — sometimes deliberately for analytics, sometimes inadvertently in their server access logs. When you paste a production JWT into jwt.io to debug an issue, that token sits in someone else's log files. When you paste an internal API response into a JSON formatter, that payload becomes a third-party data point. CipherForces developer tools are the same operations — JSON pretty-print, regex match, JWT decode, hash compute, UUID generate, color pick, base64, URL encode, hash generate — but they run entirely in your browser. The token never leaves the tab. We cannot log what we do not receive. For anyone working on production systems, internal APIs, or anything with PII running through it, that is the only acceptable posture.
Design CSS box-shadows visually and copy ready-to-paste code.
Open toolEncode or decode text with a Caesar shift cipher. ROT13 preset and brute-force decoder included.
Open toolCheck WCAG AA / AAA contrast between any two colors with live preview.
Open toolConvert between HEX, RGB, HSL, and CMYK.
Open toolLength, weight, temperature, volume, and more.
Open toolBuild linear, radial, and conic gradients visually and copy the CSS.
Open toolConvert between CSV and JSON formats instantly.
Open toolConvert text or files to and from Base64.
Open toolGenerate all favicon sizes from a single image.
Open toolPaste messy JSON and get it beautifully formatted.
Open toolCreate placeholder text for designs.
Open toolCreate unique IDs instantly.
Open toolWrite and preview Markdown with live rendering.
Open toolCompress and clean up SVG markup — smaller files, identical output.
Open toolWrite and test regular expressions with live matching.
Open toolConvert text to UPPERCASE, lowercase, camelCase, snake_case, and 8 more styles.
Open toolCompare two text blocks side-by-side with line-level highlighting.
Open toolEncode and decode URLs and edit query strings live. Two-mode tool — encode/decode any string, or paste a full URL and edit its parameters in a table.
Open toolCount words, characters, sentences, and estimate reading time.
Open toolEvery transformation runs on each keystroke. No "click to format" round-trip. Output appears in real time so debugging stays in flow.
Click metrics: yes. The text you paste into a JSON formatter or JWT decoder: never logged, never sent anywhere, period.
These tools are designed to live next to your debugger, not replace it. Open DevTools → Network tab while using any of them — you will see zero outgoing requests for your data.
JSON formatter / validator, regex tester, JWT decoder, base64 encode/decode, hash generator (MD5/SHA family), UUID v4, color picker, URL encode/decode + query string builder, lorem ipsum, text diff, text case converter, color contrast checker.
Use our JWT Decoder. The token is parsed entirely in your browser — header, payload, and signature are split, base64-decoded, and pretty-printed locally. We never see the token. For comparison, jwt.io's exact privacy posture is documented in their FAQ; ours is observable in DevTools.
Yes — our Regex Tester runs entirely in the browser using JavaScript's native RegExp. Match, replace, capture groups, named groups, and flags all work without any server round-trip.
The Hash Generator computes MD5, SHA-1, SHA-256, SHA-384, SHA-512 entirely in your browser using the Web Crypto API. Drop a file, get all five hashes simultaneously. Useful for verifying downloads against a published checksum.
84 browser-based tools across PDF, image, audio, developer, business, and security categories. All free for daily use; one-time license for unlimited.