Why this tool is useful
Prepare a smaller modern web image from a private HEIC source while seeing the exact output size before publishing or transferring it.
Local File Tools · runs locally
Private HEIC to WebP Converter
Transform a validated HEIC or HEIF photo into a compact WebP image locally with an explicit quality setting and browser capability verification.
Ready. Your working data stays in this browser.
Files and capture streams stay on this device. Processing uses browser APIs only; nothing is uploaded to YTSave, the media API or a proxy. No server copy is created, stored or left to delete. The file picker is cleared when processing starts, and disposable worker memory is destroyed after completion or cancellation. Preview and generated-output memory is released when you clear the tool or leave the page.
HEIC decoding uses the unmodified libheif build distributed with heic-to 1.5.2 under LGPL-3.0. License · Corresponding source.
How it works
A pinned local HEIF decoder reconstructs the pixels in an isolated worker, then the browser WebP encoder applies the selected quality and verifies the resulting MIME type.
Practical example
Select a camera HEIC, set WebP quality to 82, compare source and output sizes, preview the result and download it without a network upload.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.