How to Compress PDF Files Online for Free
Reduce PDF file size without losing quality. Learn the best compression settings for email, web, and print.
ToolKnit Journal
Tips, guides & how‑tos
for every tool we ship.
Hands‑on walkthroughs, format primers and decision frameworks —each piece links straight to the free, browser‑based tool.
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Articles
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Categories
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Free
PDF Tools
06
PDF Tools 5 min read
PDF Tools 4 min read
How to Merge Multiple PDF Files into One
Combine PDFs in seconds. Drag to reorder pages and download a single merged document instantly.
PDF Tools 5 min read
How to Convert PDF Pages to Images (PNG, JPG, WebP)
Extract every page from a PDF as a high-quality image. Perfect for presentations, social media, and thumbnails.
PDF Tools 4 min read
How to Convert Multiple Images to a Single PDF
Turn photos, scans, and screenshots into a clean PDF document. Reorder pages before combining.
PDF Tools 4 min read
How to Convert Word Documents to PDF Online
Convert .docx to PDF preserving formatting, tables, and styles. No Microsoft Office needed.
PDF Tools 5 min read
How to Convert PDF to Editable Word Documents
Extract text from PDF files into editable .docx format. Edit, copy, and reuse content effortlessly.
Image Tools
14
Image Tools 5 min read
How to Convert AI to PNG Online — Free & Private
Turn Adobe Illustrator files into PNG images in your browser, then pair the result with background removal for transparent assets.
Image Tools 5 min read
How to Convert HEIC to JPG Online — Free & Private
Why iPhones save HEIC, when you need JPG, and how to batch convert without uploading photos to any server.
Image Tools 5 min read
Remove Image Backgrounds with AI — Free, Private, No Upload
AI-powered background removal that runs entirely in your browser. Auto-remove or manually refine with brush tools. No sign-up needed.
Image Tools 4 min read
Resize Images Online: Custom Dimensions & Social Media Presets
Resize to exact pixels, scale by percentage, or use one-click presets for Instagram, Twitter, YouTube and more.
Image Tools 5 min read
How to Compress Images Without Losing Quality
Reduce image file sizes for faster websites and smaller emails. Batch compress JPG, PNG, and WebP.
Image Tools 4 min read
JPG to PNG: When and How to Convert
Need transparency or lossless quality? Learn when JPG-to-PNG conversion makes sense and how to do it instantly.
Image Tools 4 min read
PNG to JPG: Shrink File Size Instantly
Convert large PNG files to compact JPG for emails, uploads, and web use. Keep great quality at a fraction of the size.
Image Tools 4 min read
JPG to WebP: Boost Website Speed with Modern Images
WebP images are up to 30% smaller than JPG. Learn how to convert and speed up your website load times.
Image Tools 4 min read
PNG to WebP: Smaller Files with Transparency
Keep transparent backgrounds while dramatically reducing file size. The modern replacement for PNG on the web.
Image Tools 3 min read
WebP to JPG: Make WebP Images Compatible Everywhere
Some apps and platforms don't support WebP yet. Convert to universally compatible JPG in one click.
Image Tools 3 min read
WebP to PNG: Convert for Editing and Transparency
Need to edit a WebP image in Photoshop or Illustrator? Convert to lossless PNG with full transparency support.
Image Tools 4 min read
How to Split Images into a 3×3 Grid for Instagram
Create stunning Instagram grid posts by splitting any image into 9 perfectly sized tiles. Download as ZIP.
Image Tools 4 min read
How to Crop Images Online with Aspect Ratio Lock
Crop photos to perfect 1:1, 4:3, 16:9, or custom ratios. Ideal for profile pictures, banners, and thumbnails.
Image Tools 4 min read
Flip & Rotate Images Online — Mirror, 90°, 180°, 270°
Fix upside-down photos, create mirror effects, or correct orientation. Supports JPG, PNG, WebP and more.
Image Tools 5 min read
Free Online Circle Crop — Turn Any Image into a Round PNG
Crop any image into a perfect circle with transparent background. Drag, resize, and export as PNG. 100% browser-based, no uploads.
Video Tools
03
Video Tools 5 min read
How to Compress Videos Online Without Losing Quality
Shrink MP4, WebM, and MOV files for email, Discord, and social media. FFmpeg-powered compression in your browser.
Video Tools 4 min read
How to Convert Video Clips to GIF —Free, No Upload
Turn any video into an animated GIF right in your browser. Mark start/end points, adjust FPS and size, download instantly.
Video Tools 5 min read
How to Extract Audio from Any Video Online for Free
Extract lossless WAV audio from MP4, WebM, MOV videos entirely in your browser using the Web Audio API.
Video Tools 3 min read
Free Video Screenshot — Capture HD Frames from Any Video
Step frame-by-frame through any video and download lossless PNG screenshots. No uploads, no signup, 100% browser-based.
Audio Tools
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Audio Tools 7 min read
Online Metronome Free — Tap Tempo, BPM & Time Signatures
Practice guitar, piano, drums, vocals, and rhythm drills with BPM control, tap tempo, subdivisions, and stable browser audio.
Audio Tools 4 min read
MP3 to WAV: Convert to Lossless Audio Online
Need uncompressed audio for editing or production? Convert MP3 to WAV with PCM 16-bit output quality.
Audio Tools 4 min read
WAV to MP3: Compress Audio for Sharing and Streaming
Convert large WAV files to compact MP3 with selectable bitrate. Perfect for podcasts, music, and voice recordings.
Audio Tools 6 min read
Free Online BPM Detector — Find Any Song’s Tempo from Audio
Upload MP3, WAV, or OGG and detect the tempo instantly. Waveform visualization, beat markers, and tap tempo verification. 100% private.
Audio Tools 10 min read
Free Online Noise Generator — White, Brown & Pink Noise + Rain, Ocean, Wind, Thunder
Mix 7 ambient sounds with independent volume controls. Sleep timer, one-click presets. 100% browser-based, no signup.
Audio Tools 15 min read
Free Online MIDI Keyboard — 8 Synth Timbres, Quick Play Songs & .mid Export
Play piano in your browser with keyboard or mouse. 8 instruments including Pipa and Music Box, Quick Play Songs guide, sustain pedal, record, export .mid. Free, no signup.
AI Tools
04
AI Tools 14 min read
Free AI Tarot Card Reading — Major Arcana, DeepSeek Interpretation & 100% Privacy
Draw 1 or 3 cards from the 22 Major Arcana and get personalized AI readings. Rider-Waite Smith artwork, upright and reversed, streaming output. Your API key lives only in memory.
AI Tools 12 min read
AI Ex-Partner Chat — Talk to the Memory of Someone You Lost
Distill your ex's personality from chat records into an AI persona. Screenshot OCR, avatar-based sender detection, DeepSeek correction. Is it healthy? Maybe not. But sometimes you just need one more conversation.
AI Tools 10 min read
AI Text Adventure — Interactive Story Engine with Pixel Sound
Describe any story concept. AI generates the world, narrative, and 3 choices per turn. Pixel-style beep sound effects. Keyboard shortcuts A/B/C. Your API key never saved.
AI Tools 8 min read
AI Life Trajectory Predictor — Multi-Round Recursive Future Inference
Describe your profile. AI predicts 3-5 possible futures per round. Choose a path, AI recursively infers the next stage. Likelihood ratings, final epilogue 10+ years out.
Text Tools
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Text Tools 4 min read
Fancy Text Generator: 20+ Cool Unicode Fonts You Can Copy & Paste Anywhere
Convert plain text into stylish Unicode fonts —bold, italic, cursive, gothic, bubble, and more. Works on Instagram, TikTok, Twitter/X, Discord.
Text Tools 4 min read
Free Character Counter: Count Words, Sentences & More
Meet Twitter limits, essay requirements, and SEO guidelines. Real-time counting for English, Chinese, and mixed text.
Text Tools 4 min read
QR Code Generator: Create Custom QR Codes in Seconds
Turn URLs, text, Wi-Fi passwords, or contact info into scannable QR codes. Customize colors and download as PNG or SVG.
Text Tools 4 min read
Password Generator: Create Strong Passwords Instantly
Generate cryptographically secure passwords with custom length, character types, and a real-time strength meter.
Text Tools 3 min read
Lorem Ipsum Generator: Placeholder Text for Any Project
Generate dummy text by paragraphs, sentences, or word count. Perfect for mockups, wireframes, and layout testing.
Text Tools 5 min read
How to Extract Text from PDF, Word & 12+ Document Formats
Copy text from any document instantly. Smart auto-formatting fixes broken paragraphs. 100% browser-based, no upload needed.
Text Tools 5 min read
JSON Formatter & Validator — Beautify, Minify & Debug JSON Online
Why readable JSON matters, common syntax errors, and how to format, validate, and minify JSON in seconds.
Text Tools 6 min read
Free Invoice Generator — Create Professional PDFs in Seconds
Create invoices with multi-currency support, automatic tax calculation, and unlimited line items. Download as PDF, no sign-up.
Text Tools 5 min read
Markdown Editor — Write & Preview Markdown in Real Time
Write Markdown with instant live preview. Export .md files or copy generated HTML. Full syntax support including tables and code blocks.
Text Tools 4 min read
Text Diff — Compare Two Texts and Find Every Difference
Paste two versions of any text and instantly see additions, deletions, and changes with line-by-line highlighting.
Text Tools 8 min read
Free Online Hash Generator — MD5, SHA-1, SHA-256, SHA-512 & File Hash Checker
Generate 4 hash algorithms from text or files. HMAC support. Drag-and-drop file hashing. Compare hashes to verify integrity. 100% browser-based.
Calculator Tools
05
Calculator Tools 5 min read
Unit Converter — Convert Length, Weight, Temperature & More
Convert units instantly across 8 categories: length, weight, temperature, area, volume, speed, data, and time. Bidirectional and real-time.
Calculator Tools 4 min read
Percentage Calculator — Percent Of, Change & Ratio
Three calculators in one: find a percentage of a number, calculate percentage change, or determine what percentage one number is of another.
Calculator Tools 5 min read
Mortgage Calculator — Estimate Monthly Payments & Total Interest
Calculate mortgage payments, view amortization schedules, and compare 15-year vs 30-year loans. Free, instant, no sign-up.
Calculator Tools 4 min read
Tip Calculator — Split Bills & Calculate Gratuity Instantly
Calculate tips, split the bill evenly, and learn tipping etiquette for restaurants, bars, and delivery.
Calculator Tools 5 min read
Free BMI Calculator — Check Your Body Mass Index Instantly
Calculate BMI with metric or imperial units. Visual scale, WHO categories, and healthy weight range.
Calculator Tools 5 min read
Meeting Cost Calculator — Watch Your Meeting Burn Money in Real Time
Enter attendees and salary, hit start, and watch the cost tick up every second. Multi-currency, salary presets, and one-click share. Nothing shortens a meeting like watching it burn cash.
Time Tools
08
Time Tools 3 min read
Age Calculator: Find Out Exactly How Old You Are
Calculate your exact age in years, months, days, hours and minutes. Discover your zodiac sign, Chinese zodiac, and birthday countdown.
Time Tools 4 min read
Typing Speed Test: How Fast Can You Type?
Measure your WPM, accuracy, and keystrokes with 15, 30, or 60 second timed tests. Real-time feedback as you type.
Time Tools 4 min read
Reaction Time Test: How Fast Are Your Reflexes?
Test your reaction speed in milliseconds. 5 quick rounds, false-start detection, personal best tracking.
Time Tools 3 min read
Free Online Stopwatch with Lap Tracking
Millisecond-precision stopwatch with lap splits, fastest/slowest highlights, and a clean full-screen display.
Time Tools 3 min read
Free Online Countdown Timer with Audio Alert
Set custom countdowns with quick presets for Pomodoro, cooking, and workouts. Visual progress bar and alarm sound.
Time Tools 4 min read
World Clock: Check Time in 80+ Cities Instantly
Compare time zones across the globe. Your local time on top, search by city or country, live updating display.
Time Tools 6 min read
The Pomodoro Technique — How a Timer Can Double Your Focus
Why 25-minute focus blocks work, the science behind breaks, and how to use a free Pomodoro timer to boost productivity.
Time Tools 5 min read
Unix Timestamp Converter — Epoch to Date and Back
Convert Unix timestamps to human-readable dates and back. Auto-detects seconds vs milliseconds. Live clock included.
Creative Tools
14
Creative Tools 8 min read
Flashcard Maker Online Free — Create Study Cards with Quiz Mode
Make private study cards, flip through a deck, quiz yourself, import CSV/TXT pairs, and export JSON backups locally.
Creative Tools 7 min read
Online Signature Maker Free — Transparent PNG Signatures
Draw or type a signature online, preview it clearly, and download a transparent PNG for documents and forms.
Creative Tools 4 min read
Color Picker: Get HEX, RGB & HSL Codes Instantly
Pick any color and get every format. Extract from images, build palettes, copy codes with one click.
Creative Tools 4 min read
Free Online Whiteboard for Drawing & Brainstorming
Draw, sketch, and annotate with pen, shapes, and text. Export your work as PDF or PNG. No sign-up required.
Creative Tools 3 min read
What Should I Eat? Let This Random Picker Decide
Can't decide on lunch or dinner? Spin the wheel and get a random meal suggestion for any time of day.
Creative Tools 3 min read
Ask Fate: Magic 8-Ball Style Decision Maker
When in doubt, let the universe decide. Type your yes-or-no question and receive a mystical answer.
Creative Tools 8 min read
How to Test Your Keyboard Online —Complete Guide (2026)
Detect broken, stuck, ghosting, and double-firing keys with a free visual tester. Covers mechanical, membrane, and laptop keyboards.
Creative Tools 8 min read
Free CPS Test Online —Improve Your Click Speed
Learn what a good CPS score looks like, compare test durations, and improve your click speed with a free browser-based CPS test.
Creative Tools 7 min read
Free Coin Flip & Dice Roller Online —Random Decision Tools
Flip a coin or roll dice online for free. The math behind randomness and 5 creative ways to use decision tools.
Creative Tools 4 min read
Free Random Spinner Wheel —Make Decisions the Fun Way
Create a custom spinner wheel with up to 15 options. Spin to decide anything —lunch, names, prizes, and more.
Creative Tools 7 min read
How to Convert Any Image to Pixel Art Online for Free
Turn photos into retro pixel art with adjustable resolution, color palettes, dithering, and Game Boy/NES presets.
Creative Tools 6 min read
Free Aim Trainer Online — Improve Mouse Accuracy & Speed
Train your mouse accuracy and reaction speed with customizable targets. Track hits, misses, and average reaction time.
Creative Tools 5 min read
CSS Gradient Generator — Create Beautiful Gradients Visually
Pick colors, choose linear or radial, adjust the angle, and copy production-ready CSS code instantly.
Creative Tools 9 min read
Free Online Chart Maker — CSV to Bar, Line, Pie & Radar Charts
Paste CSV or spreadsheet data and create bar, line, area, pie, doughnut, radar, or scatter charts instantly in your browser.
Creative Tools 9 min read
Free Online Dice Roller — D4, D6, D8, D10, D12, D20, D100 & Custom
Roll any tabletop RPG or board game dice in your browser. Multi-dice rolls, custom sides, and full roll history. Free, no download.
Creative Tools 5 min read
Free Home Inventory & Item Locator —Track Where You Put Things
Record where you put things with photos, names, notes and locations. Search instantly. Camera capture on mobile. 100% private.
Creative Tools 2 min read
Free ASCII Art Generator —Convert Any Image to ASCII Text
Turn any photo into ASCII art text. Adjust width, charset, contrast. Download as TXT. 100% browser-based.
Creative Tools 2 min read
Free ASCII Text Banner Generator —Big ASCII Letters Online
Create big ASCII text banners from any word. 10+ FIGlet fonts. Download as TXT. Free, browser-based.
About ToolKnit
02
Guide 11 min read
World Holidays Calendar 2026 & 2027 — 3,400+ Public & Cultural Holidays by Country
A complete guide to public, cultural and religious holidays in 122 countries for 2026 and 2027. Country highlights, data sources, and how to use the free calendar.
About 12 min read
What Is ToolKnit? —73 Free Browser-Based Online Tools
A complete overview of every tool on ToolKnit, how they work, the technology behind them, and why your files never leave your device.
Ready to try the tools?
All tools are 100% free, browser‑based and require no sign‑up.