Private by default · Free to use
Free online tools that finish the job.
Free online PDF, image, text, time, and developer utilities that run in your browser. No account, no upload queue, and no mystery settings.
Your files stay on this device.
Clear controls. Honest trade-offs. Useful explanations.
Most used right now
Start with a popular tool
Document tools
Compress PDF
A smaller PDF with before-and-after file sizesImage tools
Image Converter
Smaller, correctly formatted images with no creditsStructured data
JSON Compare
A private, readable diff with smart array matchingSharing & print
QR Code Generator
A high-resolution PNG or SVG with no sign-up or expirationComplete collection
Find the exact utility
Search by task or narrow the list by category. Every tool opens instantly.
Sharing & print
QR Code Generator
Create a permanent static QR code for a website, Wi-Fi network, text, message, phone number, or contact.Time & focus
Countdown Timer
Count down from a preset or custom duration with pause, resume, +1 minute, sound, and refresh-safe timing.Time tracking
Timer with History
Count upward, name sessions, record lap splits, and save a searchable local history with CSV export.Image tools
Increase Image Resolution
Enlarge an image to 2×, 3×, 4×, or exact pixel dimensions with honest high-quality interpolation.Image tools
Reduce Image Resolution
Make a smaller-dimension copy by percentage or exact pixels while preserving the aspect ratio.Document tools
Compress PDF
Reduce an image-heavy PDF for email or an upload limit with clear, honest quality trade-offs.Document tools
Password Protect PDF
Add an open password with AES-256 encryption while preserving PDF text, links, forms, and page quality.Document tools
Remove PDF Password
Use a password you already know to create an unlocked copy without flattening or uploading the PDF.Document tools
JPG to PDF
Combine JPG images into one PDF with visible page order, A4 or Letter sizing, and margin controls.Document tools
PDF to JPG
Export all PDF pages or a precise range as numbered JPG files at 150, 200, or 300 DPI.Image tools
Crop Image
Create a circular profile image, or crop with common aspect ratios and exact pixel coordinates.Image tools
Image Converter
Batch-convert JPG, PNG, WebP, GIF, and BMP images with quality and maximum-width controls.Document tools
PDF ↔ Image Converter
Export PDF pages as PNG, JPG, or WebP at your chosen DPI, or combine full-resolution images into one PDF.Document tools
Merge PDF Files
Combine several PDF files into one document, previewing every page join and correcting the order before export.Document tools
Split PDF & Extract Pages
Extract selected pages into one PDF or separate a document into numbered parts packaged in a ZIP.Document tools
Reorder PDF Pages
Fix page order with visual thumbnails, precise arrow controls, rotation, removal, and one-step undo.Structured data
JSON Compare
Compare two JSON documents by meaning, remove formatting noise, and review every change by its exact path.Text differences
Text Compare
Compare an original and a new version side by side, then jump through every added, removed, or changed word.Authentication
JWT Decoder
Paste a JSON Web Token to read its header, payload, time status, and claims with beginner-friendly explanations.Linux permissions
Chmod Calculator
Build file or directory permissions visually and see what every digit allows before you run the command.Task scheduling
Crontab Generator
Turn a schedule into a standard five-field cron expression, preview upcoming runs, and add your command.Time duration
Milliseconds Converter
Convert milliseconds to minutes, seconds, hours, days, average months, and readable dates without scientific notation.Date and time
Unix Timestamp Converter
Convert epoch values to ISO, UTC, and local time with automatic detection for common timestamp units.Text formatting
Case Converter
Transform text into upper, lower, title, camel, snake, or kebab case without rewriting it by hand.Structured data
JSON Formatter
Validate a JSON document, format it for careful review, or remove optional whitespace for a compact result.Code optimization
JavaScript Minifier
Compress modern JavaScript with parser-based optimization, optional name shortening, and preserved license notices.Code formatting
JavaScript Unminifier
Turn compressed JavaScript into parser-checked, consistently formatted code without executing or uploading it.Text encoding
Base64 Encoder & Decoder
Encode UTF-8 text as Base64 or decode an existing value, with examples that explain padding and safe use.Web encoding
URL Component Encoder
Percent-encode a query value or path segment without confusing its data with a URL's separators.Skip the setup
Useful starting points
Open a familiar setting, inspect the explanation, and adjust it for your task.
Start a short break
5 minute timer
One click sets the duration; press Start when ready.Measure an open task
Timer + history
Name it, time it, then finish and save the result.Secure a regular file
chmod 644
Owner can edit; everyone else can read.Open a public directory
chmod 755
Owner can edit; everyone else can browse.Run a frequent check
Every 5 minutes
Start with */5 * * * * and add a command.Schedule a morning task
Weekdays at 9 AM
Use 0 9 * * 1-5 as a reviewed starting point.Work with confidence
The setting matters as much as the tool.
Short, practical guides explain quality, privacy, document structure, and what to verify before you download.
Browse all guidesChoose the right PDF operation
Merge, split, reorder, compress, convert, or protect—and verify what survived.
Format, size, and quality
Understand why JPG, PNG, WebP, crop, dimensions, and quality solve different problems.
Browser processing and privacy
Know what local processing protects and what still depends on your browser and device.
Test PDF compression quality
Compare real modes and verify text, images, links, forms, and signatures before sharing.
Cron time zones and DST
Plan for server clocks, missing local times, repeated runs, and safe retries.
Chmod by object type
Understand how the same permission bits behave on regular files and directories.
JWT decoding is not verification
Separate readable claims from signature and policy validation before trusting a token.
Good to know
Questions before you begin
How local processing, generated commands, time conversion, and timers work.
Does JustUtils upload the data I enter?
The current tools process your input in your browser unless a page explicitly says otherwise. You do not need an account to use them.
Which cron format does the generator use?
It uses the standard Linux five-field format: minute, hour, day of month, month, and day of week. The page explains each field and previews upcoming execution times.
How does the timestamp converter know the unit?
It examines the size of the number and detects common seconds, milliseconds, microseconds, and nanoseconds values before showing ISO, UTC, and local formats.
Is a millisecond duration the same as a timestamp?
No. A duration measures elapsed time, while a Unix timestamp identifies a calendar moment by counting from January 1, 1970 UTC. The milliseconds converter shows both interpretations and explains when the date is relevant.
Will the timers keep working after I switch tabs or refresh?
Yes. The countdown and session timer derive time from stored timestamps instead of counting browser interval ticks. Active state and timer history stay in local browser storage until you clear them.
Can I run a generated command without checking it?
Treat every generated command as a reviewed starting point. Check the path, permissions, schedule, and environment first—especially on production systems.
One dependable shortcut
Keep useful tools within reach.
Bookmark JustUtils for the next PDF, image, timing, text, or developer task.