Free browser tools that run locally
Convert, decode, format, and inspect common web data without uploading your files. CleanWebTools is built to do one task well per page, with a privacy-first workflow that keeps your input in the browser.
Start with a focused tool
Each page starts with a working browser utility, then adds the failure cases, examples, and privacy notes that help you decide whether the tool is safe for the data in front of you.
Base64 to Image Converter
Paste a Base64 string, preview the decoded image, and download it as a file. The conversion runs locally in your browser.
Image to Base64 Converter
Select an image file and generate a Base64 data URL that can be copied into HTML, CSS, JSON, or test fixtures.
JWT Decoder
Paste a JSON Web Token and inspect its header, payload, and signature segment locally in your browser.
JSON Formatter
Paste JSON, validate it, format it with indentation, or minify it into compact output for APIs and config files.
Markdown to HTML Converter
Paste Markdown, preview the rendered result, and copy sanitized HTML for docs, CMS publishing, or prototypes.
Unix Timestamp Converter
Convert Unix epoch seconds or milliseconds into local and UTC dates, or generate the current timestamp instantly.
SHA-256 Hash Generator
Paste text and generate a SHA-256 digest locally for checksums, examples, cache keys, and debugging.
Fancy Text Generator
Type normal text and copy Unicode style variants for profiles, bios, headings, notes, and quick social posts.
Built for real debugging work
CleanWebTools is for the small tasks that interrupt real work: checking a JWT claim, formatting a suspicious API response, decoding an embedded image, or confirming whether a timestamp is seconds or milliseconds. The pages stay narrow so the answer is easy to verify.
The guides document the edge cases behind those tools, including base64url alphabets, Unicode normalization, Markdown sanitization, token storage, and password hashing mistakes. When a claim depends on a standard or runtime behavior, the relevant guide links to the source or describes the test used to check it.