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Most Popular Tools
Our most frequently used utilities, crafted for speed, accuracy, and client-side convenience.
Image Compressor
Compress JPG, PNG, and WebP images directly in your browser with adjustable quality and instant size reduction preview.
Image Resizer
Resize images by custom width and height in pixels or percentages while locking aspect ratio to prevent distortion.
Image Cropper
Crop images with interactive boundary handles, freeform cropping, and popular aspect ratio presets (1:1, 16:9, 4:3, 9:16).
Image Color Picker
Upload an image and sample exact pixel colors with real-time HEX, RGB, and HSL values, magnifying loupe, and history palette.
PDF Merger
Combine multiple PDF documents into a single organized PDF file with drag-and-drop file reordering.
PDF Splitter
Extract specific pages or page ranges (e.g. 1-3, 5, 8-10) from a PDF document into a new standalone PDF.
Browse All 40 Free Online Tools
Organized by category. Click any tool to begin processing immediately in your browser.
Image Compressor
Compress JPG, PNG, and WebP images directly in your browser with adjustable quality and instant size reduction preview.
Image Resizer
Resize images by custom width and height in pixels or percentages while locking aspect ratio to prevent distortion.
Image Format Converter
Convert images instantly between PNG, JPEG, and modern WebP formats with custom lossy compression quality controls.
Image Cropper
Crop images with interactive boundary handles, freeform cropping, and popular aspect ratio presets (1:1, 16:9, 4:3, 9:16).
Image to Base64 Converter
Convert any image into a Base64 data URL string or raw Base64 string for CSS backgrounds, HTML embedding, and API payloads.
Image Color Picker
Upload an image and sample exact pixel colors with real-time HEX, RGB, and HSL values, magnifying loupe, and history palette.
PDF Merger
Combine multiple PDF documents into a single organized PDF file with drag-and-drop file reordering.
PDF Splitter
Extract specific pages or page ranges (e.g. 1-3, 5, 8-10) from a PDF document into a new standalone PDF.
PDF Compressor
Optimize and compress PDF documents in your browser by re-compressing streams and removing redundant metadata objects.
PDF to Image Converter
Render PDF pages as high-resolution PNG or JPEG images with individual downloads and page range controls.
Image to PDF Converter
Convert multiple images (JPG, PNG, WebP) into a single clean PDF document with custom margins, orientation, and page sizing.
PDF Page Rotator
Permanently rotate all or selected PDF pages by 90°, 180°, or 270° degrees to fix sideways or upside-down scanned documents.
Word Counter
Count words, characters (with & without spaces), sentences, paragraphs, and estimated reading/speaking time in real-time.
Case Converter
Convert text between UPPERCASE, lowercase, Title Case, Sentence case, alternating cAsE, kebab-case, and snake_case.
Duplicate Line Remover
Remove duplicate lines from lists or text while preserving original line order, with case-sensitive and trim options.
Text Diff Checker
Compare two text passages side-by-side or inline to highlight inserted, deleted, and modified lines and characters.
Lorem Ipsum Generator
Generate customizable dummy placeholder text by paragraphs, sentences, or word counts for design layouts and mockups.
Text Sorter
Sort lines alphabetically (A-Z or Z-A), numerically, by line length, or in reverse, with deduplication and whitespace trimming.
JSON Formatter & Validator
Format, beautify, validate, and minify JSON data with clear syntax error explanations and line-number pointers.
Base64 Encoder / Decoder
Encode text or binary data into Base64 format and decode Base64 strings back to clean UTF-8 text with error checking.
URL Encoder / Decoder
Encode query parameters and URI components safely, or decode percent-encoded URLs with malformed character detection.
UUID Generator
Generate cryptographically secure Version 4 UUIDs (Universally Unique Identifiers) in bulk with case formatting and copy options.
Hash Generator (SHA-256)
Compute cryptographic hashes (SHA-256, SHA-1, SHA-512) for text and files locally using the standard Web Crypto API.
Secure Password Generator
Generate cryptographically strong passwords using browser-native crypto.getRandomValues() with custom character sets and entropy estimates.
Scientific Calculator
Perform advanced arithmetic, trigonometry (sin/cos/tan), powers, square roots, logarithms, and constants with a safe expression parser.
Age Calculator
Calculate your exact age down to years, months, and days, along with total weeks, days, hours, and next birthday countdown.
Percentage Calculator
Calculate percentage values, percentage increases/decreases, and ratios with clean step-by-step mathematical explanations.
GST Calculator
Calculate Goods and Services Tax (GST) inclusive or exclusive with standard rate brackets (5%, 12%, 18%, 28%) and CGST/SGST splits.
Loan EMI Calculator
Calculate your monthly Equated Monthly Installment (EMI), total interest payable, and total loan payment with amortization breakdown.
Date Difference Calculator
Calculate the exact span between two calendar dates in total days, weeks, months, years, and business working days.
MP3 Converter
Convert WAV, OGG, WebM, and other audio formats to standard MP3 and playable audio formats directly in your browser.
Audio Cutter
Cut audio files with waveform preview, start/end markers, and export high-fidelity audio snippets with zero quality loss.
Audio Volume Booster
Boost the perceived volume and gain of quiet audio tracks up to 300% with built-in peak limiting and dynamic compression.
Audio Recorder
Record voice notes and microphone input with live level meter, instant playback, pause/resume, and immediate audio download.
MP4 to MP3 Converter
Extract the soundtrack from MP4, WebM, or MOV video files directly in your browser and export clean, listenable audio.
Video to Frames Converter
Extract high-resolution still image frames from any video at custom time intervals and download them individually or as a package.
Video Thumbnail Generator
Capture the perfect video frame, preview in full resolution, and export crystal-clear JPG or PNG thumbnails for YouTube and social media.
PDF to Text Converter
Extract selectable text from PDF documents page by page, preview in clean editor, and download as plain text (.txt) file.
PDF Watermark Tool
Overlay custom text watermarks (CONFIDENTIAL, DRAFT, copyright notices) with diagonal rotation, opacity, and color controls.
Social Media Video Downloader
Open, preview, and download videos using supported and authorized methods for YouTube, Instagram, and Facebook.
Image Tools
Client-side compression, resizing, conversion, cropping, and color extraction.
Image Compressor
Compress JPG, PNG, and WebP images directly in your browser with adjustable quality and instant size reduction preview.
Image Resizer
Resize images by custom width and height in pixels or percentages while locking aspect ratio to prevent distortion.
Image Format Converter
Convert images instantly between PNG, JPEG, and modern WebP formats with custom lossy compression quality controls.
Image Cropper
Crop images with interactive boundary handles, freeform cropping, and popular aspect ratio presets (1:1, 16:9, 4:3, 9:16).
Image to Base64 Converter
Convert any image into a Base64 data URL string or raw Base64 string for CSS backgrounds, HTML embedding, and API payloads.
Image Color Picker
Upload an image and sample exact pixel colors with real-time HEX, RGB, and HSL values, magnifying loupe, and history palette.
PDF Utilities
Zero-cloud merging, splitting, compressing, page rotation, and image extraction.
PDF Merger
Combine multiple PDF documents into a single organized PDF file with drag-and-drop file reordering.
PDF Splitter
Extract specific pages or page ranges (e.g. 1-3, 5, 8-10) from a PDF document into a new standalone PDF.
PDF Compressor
Optimize and compress PDF documents in your browser by re-compressing streams and removing redundant metadata objects.
PDF to Image Converter
Render PDF pages as high-resolution PNG or JPEG images with individual downloads and page range controls.
Image to PDF Converter
Convert multiple images (JPG, PNG, WebP) into a single clean PDF document with custom margins, orientation, and page sizing.
PDF Page Rotator
Permanently rotate all or selected PDF pages by 90°, 180°, or 270° degrees to fix sideways or upside-down scanned documents.
Text & Content Tools
Word counting, case formatting, deduplication, diff comparison, and sorting.
Word Counter
Count words, characters (with & without spaces), sentences, paragraphs, and estimated reading/speaking time in real-time.
Case Converter
Convert text between UPPERCASE, lowercase, Title Case, Sentence case, alternating cAsE, kebab-case, and snake_case.
Duplicate Line Remover
Remove duplicate lines from lists or text while preserving original line order, with case-sensitive and trim options.
Text Diff Checker
Compare two text passages side-by-side or inline to highlight inserted, deleted, and modified lines and characters.
Lorem Ipsum Generator
Generate customizable dummy placeholder text by paragraphs, sentences, or word counts for design layouts and mockups.
Text Sorter
Sort lines alphabetically (A-Z or Z-A), numerically, by line length, or in reverse, with deduplication and whitespace trimming.
Developer Utilities
JSON formatting, Base64/URL encoding, UUID generation, hashing, and password tools.
JSON Formatter & Validator
Format, beautify, validate, and minify JSON data with clear syntax error explanations and line-number pointers.
Base64 Encoder / Decoder
Encode text or binary data into Base64 format and decode Base64 strings back to clean UTF-8 text with error checking.
URL Encoder / Decoder
Encode query parameters and URI components safely, or decode percent-encoded URLs with malformed character detection.
UUID Generator
Generate cryptographically secure Version 4 UUIDs (Universally Unique Identifiers) in bulk with case formatting and copy options.
Hash Generator (SHA-256)
Compute cryptographic hashes (SHA-256, SHA-1, SHA-512) for text and files locally using the standard Web Crypto API.
Secure Password Generator
Generate cryptographically strong passwords using browser-native crypto.getRandomValues() with custom character sets and entropy estimates.
Calculators
Scientific calculations, age computation, percentages, GST, EMI, and date spans.
Scientific Calculator
Perform advanced arithmetic, trigonometry (sin/cos/tan), powers, square roots, logarithms, and constants with a safe expression parser.
Age Calculator
Calculate your exact age down to years, months, and days, along with total weeks, days, hours, and next birthday countdown.
Percentage Calculator
Calculate percentage values, percentage increases/decreases, and ratios with clean step-by-step mathematical explanations.
GST Calculator
Calculate Goods and Services Tax (GST) inclusive or exclusive with standard rate brackets (5%, 12%, 18%, 28%) and CGST/SGST splits.
Loan EMI Calculator
Calculate your monthly Equated Monthly Installment (EMI), total interest payable, and total loan payment with amortization breakdown.
Date Difference Calculator
Calculate the exact span between two calendar dates in total days, weeks, months, years, and business working days.
Audio Utilities
Format conversion, trimming, audio boosting, and in-browser voice recording.
MP3 Converter
Convert WAV, OGG, WebM, and other audio formats to standard MP3 and playable audio formats directly in your browser.
Audio Cutter
Cut audio files with waveform preview, start/end markers, and export high-fidelity audio snippets with zero quality loss.
Audio Volume Booster
Boost the perceived volume and gain of quiet audio tracks up to 300% with built-in peak limiting and dynamic compression.
Audio Recorder
Record voice notes and microphone input with live level meter, instant playback, pause/resume, and immediate audio download.
Video Utilities
Audio extraction, frame sequence capturing, and thumbnail generation.
MP4 to MP3 Converter
Extract the soundtrack from MP4, WebM, or MOV video files directly in your browser and export clean, listenable audio.
Video to Frames Converter
Extract high-resolution still image frames from any video at custom time intervals and download them individually or as a package.
Video Thumbnail Generator
Capture the perfect video frame, preview in full resolution, and export crystal-clear JPG or PNG thumbnails for YouTube and social media.
Advanced PDF & Document Tools
Text extraction and watermark stamping.
PDF to Text Converter
Extract selectable text from PDF documents page by page, preview in clean editor, and download as plain text (.txt) file.
PDF Watermark Tool
Overlay custom text watermarks (CONFIDENTIAL, DRAFT, copyright notices) with diagonal rotation, opacity, and color controls.
Why Professionals Choose GS MultiTools
Engineered from the ground up for speed, security, and an uncompromising respect for user data privacy.
100% In-Browser Processing
Your files and sensitive texts are processed exclusively inside your computer's browser using HTML5 Canvas, Web Crypto, and local Web APIs. Nothing is ever sent to a remote server.
Zero Accounts or API Keys
No registration forms, no paywalls, and no subscription tiers. Access every single tool instantly without providing email addresses or generating API credentials.
Instant Performance
Because calculations and conversions occur on your local device hardware, there is zero upload latency or waiting for remote server queues.
Mobile & Touch Optimized
Every tool is engineered with responsive viewports, accessible keyboard navigation, and touch-friendly controls across phones, tablets, and desktop workstations.
How to Use Any Tool on the Platform
Get your tasks done in seconds with no complicated configurations.
Select Your Tool
Browse our 40 tools above or use the quick search bar (/) to jump directly to any utility.
Input Your Data or File
Drag and drop an image or PDF, paste your text or JSON, or enter your calculator numbers.
Download or Copy Result
Review the instant preview, then click to download your processed file or copy the text output.
Frequently Asked Questions
Common questions about GS MultiTools, browser processing, and file safety.
Have Questions or Feature Suggestions?
We are committed to maintaining accurate, accessible, and fast tools. If you encounter an issue or have a suggestion for a new utility, please contact our team.