How to Reduce JPEG File Size
Modern phone cameras produce JPEGs of 5–15MB each — wonderful for printing, absurd for sharing. A dozen such photos will choke an email, stall an upload form, and eat mobile data. The good news: JPEG is designed to be tuned. Lowering the quality setting and trimming oversized dimensions can shrink a 12MB photo to 300KB with no visible difference on screen. Re-Sizefy puts both controls — plus batch processing — in your browser, with zero uploads.
Step-by-step: shrink a JPEG
- Drop in your JPEGs. One photo or hundreds — drag them all into the drop zone at once.
- Keep JPG as the output format. Re-encoding as JPG keeps maximum compatibility while the quality slider does the shrinking.
- Set quality to 78–82. This is the sweet spot for photos: dramatically smaller than a camera-original (which is effectively quality 95+), visually identical on screens. Watch the live preview as you adjust.
- Resize the long edge. For screen viewing and sharing, 1600–1920px is plenty. A 6000px-wide original has roughly 10x the pixels of a 1920px version — that is 10x the bytes for detail no screen can show.
- Download. Single files download directly; batches arrive as one ZIP. Use the renaming options to add a suffix like
-webso the lightweight copies are easy to tell apart.
Quality tips
Think of quality 80 as “camera JPEG, but sane.” Phone cameras save at very high quality settings meant for printing; for anything viewed on a screen, 75–82 is visually equivalent at a third of the size.
For very large downscales (6000px → 1600px), enable multi-step resizing if available — shrinking in stages preserves slightly more detail than one giant jump.
As a side benefit, re-encoding through the browser strips metadata (EXIF) like GPS coordinates from the output — one less privacy leak when sharing photos publicly.
Things to watch out for
- Do not re-compress repeatedly. Every JPG save discards a little more detail. Shrink once from the original; do not take an already-shrunk JPG and shrink it again next week.
- Below quality 60, everyone can tell. Faces get waxy, skies get blotchy, text gets fuzzy. If you need extreme sizes, shrink the dimensions instead of crushing the quality.
- Keep originals for printing. A 300KB web copy will look soft as a large print. Archive the full-resolution originals separately.
Try it now
Open the free Re-Sizefy converter — drop in your JPEGs, set quality 80, download the shrunken batch. No sign-up, no upload.
Frequently asked questions
How much smaller can a JPEG get?
A 12MB phone photo typically becomes 300–600KB at 1920px / quality 80 — a 95% reduction with no visible difference on screen.
What quality setting should I use?
80 is the all-round answer for photos. Use 85+ for images you might print small, 70–75 when size matters more than perfection.
Will reducing file size remove EXIF data?
Re-encoding in the browser does not carry over metadata like GPS tags — the output is a clean image, which is a privacy plus when sharing.
Can I process hundreds of photos at once?
Yes. Batch mode applies the same quality and resize settings to every file and bundles the results into one ZIP download.