ToolHubFree - Online Image Tools & Developer Toolbox | Compress, Convert, Watermark Images
ToolHubFree is a free online toolkit for image processing and developer utilities. Easily compress images without quality loss, convert PNG/JPG/WebP formats, add watermarks, resize and crop images. Also includes screenshot stitching, video to GIF, JSON formatter, QR code generator, and 30+ useful tools. No installation required.
Image & Visual
Image Stitch / Long Screenshot
Free online long screenshot maker. Stitch multiple images or screenshots vertically or horizontally into one seamless long image.
Image Watermark
Free online image watermarking tool. Add custom text or logo watermarks to your photos to protect copyright. Configurable opacity, position, and size.
Image Collage (Grid)
Free online photo collage maker. Arrange multiple images into a grid layout with custom columns, border size, and spacing.
Image Compression
Free online lossless image compressor. Adjust JPEG, PNG, and WebP quality parameters to significantly reduce image file size while keeping high visual quality.
Image Format Converter
Universal online image format converter. Convert PNG to JPG (with auto-filled solid backgrounds), WebP, GIF, BMP, and other formats instantly.
Image Resize
Free online image resizer. Change image dimensions and resolution by setting custom width and height, or scale proportionally.
Favicon Generator
Free online Favicon generator. Upload an image and generate a standard multi-size .ico file for your website or app development.
Image to Base64
Free online image to Base64 encoder. Convert local images to Base64 Data URI strings for web development, or decode Base64 back to images.
Image Crop
Free online image cropping tool. Drag to select a crop area on the preview, or enter exact pixel coordinates to cut your images perfectly.
Image Rotation
Free online image rotation tool. Rotate photos 90 degrees, 180 degrees, or to any custom angle. Non-right angles are auto-filled with background color.
Image Border
Free online image border tool. Add a solid-colored border around your photos with custom pixel width and hex colors.
Image to Grayscale
Free online image to grayscale converter. Apply a black and white filter to your colorful photos in one click while keeping the original resolution.
EXIF Viewer
Free online EXIF viewer. Read and display complete photo metadata, including camera models, exposure settings, GPS locations, and device info.
Background Remover
Free online background remover. Erase solid-color backgrounds based on color tolerance and export as a transparent PNG cutout.
Signature Pad
Handwritten signature with transparent or white background, custom canvas size, PNG export
GIF Splitter
Free online GIF splitter. Extract frames from any GIF animation and download them as high-quality PNG image sequences in a ZIP archive.
GIF Merger
Free online GIF merger. Combine multiple static images (JPG/PNG) into one animated GIF with custom frame rates and loop counts.
Code & Text
Code Formatter / Minifier
Free online code formatter and minifier. Beautify or compress JSON, HTML, CSS, JS, and common backend languages (Python, C#, C++, Rust, Go) to improve readability.
Text Diff Checker
Free online text diff checker. Visually compare two text or code snippets line-by-line. Green highlights additions, red highlights deletions.
Text Deduplicator
Free online text deduplicator. Quickly clean up your lists by removing duplicate lines, featuring options for case-insensitive modes and blank-line ignoring.
Developer
Hash Generator
Free online hash generator. Instantly calculate high-security hashes including MD5, SHA1, SHA256, and SHA512 for any text string.
UUID Generator
Free online UUID generator. Instantly generate batches of RFC 4122 compliant UUID v4 (Universally Unique Identifiers) for your database or dev testing.
Timestamp Converter
Free online Unix timestamp converter. Seamlessly convert between standard date/time and 10-digit (seconds) or 13-digit (milliseconds) epoch timestamps.
URL Encoder / Decoder
Free online URL encoder and decoder. Process URL string encoding safely, supporting both RFC 3986 (rawurlencode) and standard form (urlencode) modes.
JSON Formatter
Free online JSON formatter and parser. Validate JSON syntax, pretty-print, or minify your data in one click, featuring colorful syntax highlighting.
Regex Tester
Free online Regular Expression tester. Test PHP PCRE regex logic in real-time with highlighted match results and offset positions.
Utilities
QR Code Generator
Free online QR code generator. Instantly convert text or URLs into high-quality QR codes with custom sizes and one-click PNG downloads.
QR Code Decoder
Free online QR code decoder. Upload an image or paste from your clipboard to instantly scan and extract hidden links or text content.
Short URL Generator
Free online short URL generator. Shrink long and ugly links into short, shareable URLs. Identical links return unique short codes to help track visits.
Markdown Editor
Free online Markdown editor. Enjoy real-time split-screen preview with full syntax highlighting, and export your markdown content directly to HTML.
Age Calculator
Free online age calculator. Enter your birth date to calculate your exact age in years, months, and days, with a live countdown to your next birthday.
Date Calculator
Free online date calculator. Quickly calculate the time difference between two dates in days, weeks, months, and hours.
Lunar Birthday Calculator
Free online Lunar birthday calculator. Enter a Gregorian calendar date to find the corresponding Chinese Lunar date and upcoming birthday timings.
BMI Calculator
Free online BMI calculator. Enter your height and weight to calculate your Body Mass Index (BMI) instantly, including health categories and ideal weight ranges.
Ebooks
EPUB to PDF
Free online EPUB to PDF converter. Upload an EPUB ebook and convert it to a high-quality PDF document quickly for easy reading and printing.
Ebook format converter
Select one or more ebooks and convert to the same output format. Multiple files are delivered as a ZIP.
Ebook metadata
Upload an ebook to view title, author, ISBN, and other embedded info.
Ebook polish
Improve layout and structure for EPUB / MOBI / AZW3.
Fetch book metadata
Query online sources by title, author, and optional ISBN; download OPF.
Desktop Only
Video to GIF
Free online video to GIF converter. Trim a specific video segment from your local file and convert it into a highly shareable animated GIF.
Video Compression
Local desktop video compressor. Shrink MP4/MOV video sizes with advanced CRF quality and encoding-speed controls. Fast, secure, and no upload limits.
Screen Capture
Free online screen capture tool. Choose a full screen, specific window, or browser tab, and capture a screenshot saved directly to your local drive.
Screen Recorder
Free local screen recorder. Select your entire screen, a specific window, or browser tab, and record directly to WebM format saved locally.
Desktop Pet
A cute desktop companion