[ 100% local · 0 network calls ]
The private, offline toolkit that never phones home.
offlineutils.com is a free collection of 27 developer utilities — JSON formatting, encoding, hashing, password generation and more — that run 100% in your browser. No uploads, no tracking, no accounts. Paste a production secret and watch the network: nothing leaves the tab.
- tools
- 27
- categories
- 4
- servers
- 0
- trackers
- 0
local-shell~/offlineutils
$ offlineutils verify --privacy
✓ computation runs on-device
✓ no analytics, ads, or cookies
✓ inputs never serialized to the network
third-party requests: 00 // verified — nothing left the tab
$
- JSON FormatterFormat, validate and minify JSON entirely in your browser.
- Base64 Encoder / DecoderEncode text to Base64 and decode it back, all offline.
- URL Encoder / DecoderPercent-encode and decode URL components instantly.
- URL ParserBreak any URL into its protocol, host, path and query parameters.
- JWT DecoderDecode and inspect JSON Web Token claims without sending them anywhere.
- Regex TesterTest JavaScript regular expressions with live match highlighting.
- UUID GeneratorGenerate cryptographically random UUIDs (v4) in bulk.
- ULID GeneratorGenerate time-ordered, URL-safe ULIDs in bulk.
- Hash GeneratorCompute SHA-256, SHA-1, SHA-512 and MD5 hashes in the browser.
- Timestamp ConverterConvert between Unix timestamps, ISO 8601, and human-readable dates.
- Cron Expression ExplainerTranslate cron expressions into plain English and preview the next runs.
- CSS Flexbox & Grid PlaygroundVisually compose Flexbox and Grid layouts and copy the CSS.
- Word & Character CounterCount words, characters, sentences and estimate reading time.
- Password GeneratorGenerate strong, cryptographically random passwords offline.
- Lorem Ipsum GeneratorGenerate placeholder Lorem Ipsum text in seconds.
- Text DiffCompare two pieces of text and highlight what changed.
- Case ConverterConvert between camelCase, snake_case, kebab-case, PascalCase and more.
- List Deduplicator & SorterClean a list — strip duplicates, sort, trim and reformat.
- Social Media Post PreviewerSee exactly where your post gets truncated on X, LinkedIn, Bluesky and YouTube.
- Color ConverterConvert colors between HEX, RGB, HSL, and OKLCH.
- QR Code Generator & ScannerGenerate QR codes from any text, or scan one with your webcam.
- Image Resizer & CropperResize, crop and compress images on your device, never uploaded.
- SVG to PNG ConverterConvert SVG markup or files to crisp PNG at any resolution.
- Image Format ConverterConvert PNG, JPEG and WebP — bulk, in your browser.
- EXIF Metadata StripperRemove GPS, camera and timestamp metadata from photos before sharing.
// faq
Frequently asked questions
Is offlineutils.com free?
Yes. Every tool is completely free with no signup, no account, and no usage limits. There is no paid tier — the whole suite is free to use as often as you like.
Is my data uploaded or stored anywhere?
No. Every tool runs entirely in your browser, so the text, files, and secrets you paste are never sent to a server, logged, or stored. You can confirm it yourself: open your browser's DevTools, watch the Network panel, and press a button — you'll see zero requests.
Do the tools work offline?
Yes. Once a page has loaded, the tools keep working with no internet connection because all processing happens locally on your device. You can also install offlineutils.com as a PWA and run it like a native app.
Do I need to install anything or create an account?
No. There's nothing to install, no browser extension, and no account to create. Open any tool and start using it immediately.
Is it safe to paste production secrets or sensitive data?
Yes. Because nothing you enter leaves your browser, it's safe to paste production payloads, API tokens, customer data, or private drafts — there's no server to log or leak them. That's the core reason offlineutils.com runs everything client-side.
How is this different from other online formatters and decoders?
Most 'online' tools upload your input to a server to process it. offlineutils.com does all the work in your browser instead, so your data never travels. You get the same result with none of the privacy risk — and it keeps working offline.
// learn
Go deeper than the tools
// why offline
Your data never travels.
When a tool runs in your browser, nothing is uploaded — so you can paste production secrets, customer payloads, or private documents without worrying about logs, breaches, or third-party access. Verify it yourself: open DevTools → Network and watch nothing happen.