Media & Images
In-browser image conversion and platform-preview simulators powered by the Canvas API — files never leave your device.
12 tools · all 100% in-browser · zero uploads
YouTube Thumbnail Previewer
Preview any image as a real YouTube thumbnail with mobile feed overlays — check legibility before you publish.
WebP to PNG Converter
Batch-convert WebP images to lossless PNG in your browser via Canvas — with before/after size comparison.
Camera Crop Factor & 35mm Equivalent Calculator
Calculate 35mm full-frame equivalent focal length, depth-of-field aperture blur, and horizontal field of view across camera sensors.
Audio Duration to Video Frames Calculator
Convert audio duration in seconds into exact animation frame counts and SMPTE timecodes across 24, 25, 30, and 60 fps.
Video Codec File Size & Bitrate Estimator
Compare estimated video file sizes across H.264, H.265 (HEVC), AV1, and Apple ProRes 422 for 1080p, 4K, and 8K projects.
Slow-Motion Video Speed Percentage Calculator
Calculate exact playback speed percentage, slowdown factor, and timeline duration for 60fps, 120fps, and 240fps video footage.
Emoji & Monogram SVG Favicon Maker
Create scalable vector SVG favicons and inline HTML link tags from any emoji or letter with custom background shapes and colors.
Target Video Bitrate & File Size Matcher
Calculate target video export bitrates (kbps/Mbps) to fit under strict upload caps for Discord (25MB), Slack, and WhatsApp with FFmpeg commands.
Video Letterbox & Aspect Ratio Simulator
Calculate exact letterbox/pillarbox black matte bar dimensions and screen utilization percentages for video aspect ratios.
SMPTE 12M Timecode & Frame Calculator
Convert broadcast video timecode (HH:MM:SS:FF) to total frame counts and milliseconds across 23.976, 24, 25, 29.97, and 60 fps.
PNG Alpha Channel & Halo Inspector
Inspect transparent PNG and WebP graphics for semi-transparent edge halos, dirty alpha noise, and unflattened fringe artifacts.
Watermark Position & FFmpeg Calibrator
Calculate exact pixel and percentage coordinates across 9 anchor points with ready-to-use FFmpeg overlay commands.
Working in Media & Images
Uploading a product screenshot or a personal photo to a random 'free online converter' means handing that file to an unknown server, often in an unknown jurisdiction. The ASG Tools media category eliminates the upload entirely: your image is read with the browser's FileReader API, drawn onto an in-memory HTML canvas, and re-encoded — all inside your tab. The WebP to PNG converter processes batches of images this way and hands you the PNGs as direct downloads; the bytes never touch a network.
The YouTube thumbnail previewer applies the same local-first approach to design QA. Drop any image and see it cropped to the exact 16:9 thumbnail geometry YouTube uses, overlaid with a simulated mobile feed card — duration badge, title line, channel row — so you can judge legibility and composition before publishing. Because the simulation is rendered from your local file, unreleased video assets stay private.
Canvas-based processing is not just private, it is fast: there is no upload bandwidth to wait for, and batch conversion of a dozen WebP files typically finishes in the time a traditional web converter spends accepting the first upload. Future batches will add favicon resizers, image compressors and format inspectors under the same zero-upload contract.