BYTETOOLS

Bulk Image Compressor

Compress up to 30 images at once with one quality setting. See per-file and total savings, then download all — private, in-browser batch compression.

Drop up to 30 images to compressCompressed locally — never uploaded

What is the Bulk Image Compressor?

The ByteTools Bulk Image Compressor shrinks a whole set of photos in one go. Drop in up to 30 images, choose one quality level and an output format, and every file is re-encoded on the spot.

  • Compress up to 30 images in one batch
  • One quality slider applied to every file
  • JPEG or WebP output — WebP saves roughly 25–30% more
  • Per-file before/after sizes and percent saved
  • Total batch savings shown at a glance
  • 100% private — photos never leave your browser

How to use the Bulk Image Compressor

  1. 1

    Drop up to 30 images into the upload area.

  2. 2

    Set the quality slider and choose JPEG or WebP output.

  3. 3

    Click Compress All and review the per-file savings table.

  4. 4

    Download files individually or grab everything with Download All.

About the Bulk Image Compressor

The ByteTools Bulk Image Compressor shrinks a whole set of photos in one go. Drop in up to 30 images, choose one quality level and an output format, and every file is re-encoded on the spot. A results table shows each file's original size, new size and percentage saved, plus the total space reclaimed across the batch.

It is the quick fix for oversized photo folders: web galleries that load slowly, email attachments that bounce, cloud storage filling up, or a CMS that wants everything under a size budget. Keeping the pixel dimensions untouched, it squeezes bytes purely through smarter encoding.

Compression runs 100% locally in your browser — no queue, no server, no upload. Client shoots and personal photos never leave your device.

Frequently asked questions

How much smaller will my images get?

Photos saved at high quality or as PNG typically shrink 50–90% at quality 70–80 with no visible change at normal viewing size. Images that were already tightly compressed shrink less — the table shows the exact saving per file so nothing is a guess.

What quality setting should I use for batch compression?

Quality 70–80 is the practical sweet spot for web and email: big savings, invisible artifacts on photos. Go higher (85–90) for portfolio images, lower (50–60) only for thumbnails where size matters more than close inspection.

Does compressing change my image dimensions?

No. This tool keeps the pixel dimensions exactly as they are and reduces file size through re-encoding alone. If you also want smaller dimensions, run the images through the Bulk Image Resizer first — resizing plus compression multiplies the savings.

Should I output JPEG or WebP?

WebP compresses roughly 25–30% better at the same visual quality and every modern browser supports it. Pick JPEG when the images must open in older software, email clients or systems that still reject WebP.

Can I compress PNG screenshots with this tool?

Yes — they convert to JPEG or WebP, which is usually a massive saving. Just note that transparency is flattened to white and razor-sharp text can soften slightly at lower qualities, so keep quality at 80+ for text-heavy screenshots.

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