Compress to ≤ 3 MB

Specifications

Output format	JPEG @ 92% quality
File-size cap	3MB
Processing	100% in your browser — no upload
Cost	Free, unlimited

When you'd run Compress to ≤ 3 MB

Attaching the file to an email when the provider caps individual attachments near 3mb.
Uploading to a contact form, ticket system, or government portal that rejects anything above the 3mb ceiling.
Sending the image over a slow connection — mobile data, satellite, in-flight Wi-Fi — where every kilobyte matters.
Posting to a forum, community, or low-quota web host with strict per-file size limits.

How Compress to ≤ 3 MB runs

This preset is a deterministic recipe — every step has fixed parameters so the result is byte-identical across runs of the same input.

Compress to ≤ 3mb as JPEG.

Where the work happens

The compression loop runs in your browser. The encoder binary-searches JPEG quality to find the highest setting that keeps the output below 3mb, evaluating each candidate on the canvas without a network round-trip.

For inputs larger than the preset's max-width ceiling, the image is also down-sampled to the ceiling before compression so the file-size budget isn't spent on resolution that the final viewer wouldn't display anyway.

Common mistakes

Setting the target lower than the source can sustain. Compress to ≤ 3 MB compresses to ≤ 3mb, but a 12-megapixel photo squeezed below 100 KB will visibly soften — pair the limit with a maxWidth ceiling like this preset does.
Compressing then editing. Each save round-trip through JPEG compounds artefacts; do all your edits first, then run this preset as the final step.
Using a generic PDF compressor for image-heavy PDFs. If the original is a photo, compressing the image directly with this preset is faster and produces a smaller file than wrapping the result in a PDF.
Uploading sensitive images to a server-side tool. This preset runs entirely in your browser; the file never leaves your device. Verify this in your browser's network panel if working with confidential material.

FAQ

What does Compress to ≤ 3 MB output?

The original image, recompressed below 3mb in JPEG. Dimensions are preserved unless your source is wider than the preset's max-width ceiling.

Why JPEG and not PNG?

The target accepts JPEG, and JPEG compresses photographic content 5-10× smaller than PNG with no visible difference at quality 92%. PNG is the right choice only when the image has hard edges or transparency — which photo-ID, social posts, and product photos don't.

Why a 3mb ceiling?

Many upload portals — email attachments, document submissions, cheap web hosts — cap individual file uploads near 3mb. The preset finds the highest JPEG quality that fits below that limit, so the result is the best image that the recipient can actually receive.

Does my image get uploaded?

No. This preset runs entirely in your browser using WebAssembly + canvas APIs — no server round-trip. You can verify this in your browser's network panel: only static asset requests, no image upload. The file never leaves your device.

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