[ 100% local · 0 third-party calls ]
The private, offline toolkit that never phones home.
offlineutils.com is a free collection of 61browser-based tools for developers and creators — format JSON, decode JWTs, convert data, resize images, and merge, split & secure PDFs — that run 100% in your browser. No uploads, no accounts, no cookies. Paste a production secret and watch the network: your input never leaves the tab.
- tools
- 61
- categories
- 7
- servers
- 0
- cookies
- 0
local-shell~/offlineutils
$ offlineutils verify --privacy
✓ computation runs on-device
✓ no cookies, ads, or fingerprinting
✓ inputs never serialized to the network
third-party requests: 00 // verified — no third-party calls
$
- 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.
- Number Base ConverterConvert numbers between binary, octal, decimal, hex and any base.
- SQL FormatterBeautify and standardize SQL queries for 7 dialects, in your browser.
- HTML Entity Encoder / DecoderEncode text to HTML entities and decode them back.
- 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.
- Markdown to HTMLConvert Markdown to HTML (and HTML back to Markdown), with live preview.
- URL Slug GeneratorTurn any title into a clean, URL-safe slug.
- Text RepeaterRepeat text any number of times with a chosen separator.
- Remove Line BreaksStrip or collapse line breaks and extra whitespace from text.
- 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.
- Image CompressorShrink JPEG/WebP images to a target size, in your browser.
- Image to Base64Encode an image as a Base64 data URI (and decode back), in your browser.
- Favicon GeneratorTurn any image into a full favicon set and .ico, in your browser.
- Color ConverterConvert colors between HEX, RGB, HSL, and OKLCH.
- Color MixerBlend two colors and get the intermediate steps as CSS.
- Color Shades GeneratorGenerate tints and shades of any color as an even OKLCH ramp.
- Color Palette GeneratorBuild harmonious color palettes from one base color — no AI.
- Color Contrast CheckerCheck WCAG contrast between two colors with AA/AAA pass-fail.
- Image Color PickerPick any pixel's color from an image and extract its palette.
- CSS Gradient GeneratorDesign linear, radial & conic gradients and copy the CSS.
- Box Shadow GeneratorDial in a CSS box-shadow visually and copy the code.
- Border Radius GeneratorRound each corner independently and copy the border-radius CSS.
- Glassmorphism GeneratorCreate frosted-glass CSS with backdrop-blur and copy it.
- Cubic Bezier GeneratorCraft CSS easing curves by dragging control points, with live preview.
- Clip Path GeneratorDraw CSS clip-path shapes with draggable points and copy the code.
- PX to REM ConverterConvert px to rem (and back) at any root font size, with a table.
- CSS Background Pattern GeneratorBuild repeating CSS background patterns from pure gradients.
- CSS Triangle GeneratorGenerate CSS triangles and corner shapes with the border trick.
- CSS Loader GeneratorCreate single-element CSS spinners and loaders with keyframes.
- Aspect Ratio CalculatorScale dimensions to a ratio, or reduce dimensions to a ratio.
- Merge PDFCombine multiple PDFs into one — reorder by drag, all in your browser.
- Split PDFExtract page ranges or burst a PDF into single pages — in your browser.
- Organize PDF PagesReorder, rotate and delete PDF pages visually, then export — in-browser.
- Images to PDFCombine JPG and PNG images into a single PDF — in your browser.
- PDF to ImagesRender each PDF page to a PNG or JPEG — in your browser.
- Extract Text from PDFPull the selectable text out of a PDF — in your browser.
- PDF PasswordAdd or remove a PDF password (AES) — entirely in your browser.
// 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 you use analytics or track me?
We count anonymous page views with Vercel Web Analytics so we know which tools people actually use. It uses no cookies, stores no IP address, does no fingerprinting, and can't follow you across days or sites. The data you type into a tool is never part of it — nothing you enter ever leaves your browser.
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, use any tool, and watch it make zero requests.