Resize JPEG

How to Resize JPEG Images Online

1. Choose Your JPEG Files: Drag and drop JPEG images onto the page or click "Choose JPG files" — up to 50 at once. The first photo opens in the editor and the rest line up as thumbnails below it; with two or more photos open, "Add more" adds files to the same batch.
2. Set the New Size: In Resize, type a "Width" or "Height" in pixels or percent — with "Keep aspect ratio" on, the other side follows — or pick a "Size preset" (percent of original, a target height, or a platform size such as an Instagram post). The size applies to every photo in the batch.
3. Pick the Output Format (Optional): "Save as" keeps "Same as original" or saves as JPG, PNG, WebP or another format. For JPG, WebP and AVIF output, the "Quality" slider (40–100) trades file size against detail. Resize, Crop, Rotate and Flip all work in the same session, and "Undo" steps back.
4. Download: Click the Download button, which names the output format (for example "Download PNG"), for one photo, or "Download all (.zip)" for a batch — "Download one by one" saves the files separately. JPEG files are processed right in your browser, so they are not uploaded. No sign-up, no watermark.

Why Resize JPEG Images?

JPEG is the most common photo format on the web, ratified as ISO/IEC 10918-1 in 1992 and still the default output from nearly every phone and DSLR. Files with the.jpeg extension are identical in encoding to.jpg files — the only reason both extensions exist is that DOS and Windows FAT-16 capped extensions at three characters in the early 1990s, so.jpeg had to be shortened. UNIX and macOS kept the four-letter form, which is why.jpeg is common in cross-platform workflows and scanned-document pipelines.

• Faster page loads and better Core Web Vitals — A 4000 × 3000 photo served at 800 px CSS width wastes ~93% of the bytes downloaded. Google's Largest Contentful Paint metric penalizes oversized images; resizing to actual display dimensions is the single biggest win for image-heavy pages.
• Hit social-media platform specs exactly — Instagram displays feed posts at 1080 px wide, X/Twitter caps timeline images at 4096 × 4096, LinkedIn banners need 1584 × 396. Uploading the right size avoids automatic cropping and the soft re-compression each platform applies.
• Send photos by email or chat — Gmail caps attachments at 25 MB, Outlook.com at 20 MB, and a single 48 MP iPhone.jpeg can already be 8-12 MB. Resize 4032 × 3024 down to 1600 × 1200 and you're typically under 500 KB without visible quality loss on a phone screen.
• Print at the right physical size — Photo prints need ~300 DPI: a 4 × 6 in print wants 1200 × 1800 px, an 8 × 10 in wants 2400 × 3000 px. Going much higher wastes ink and storage; going lower produces pixelation at the edges.
• Make a US passport / visa photo — The State Department's online visa photo specification calls for a square JPEG between 600 × 600 and 1200 × 1200 px, sRGB at 24 bits/pixel, and 240 KB or smaller. Resize and re-save at high quality, then check the file size before upload.
• Preserve cross-platform.jpeg filenames — macOS and Linux photo libraries, scanner output, and many CMS imports use the four-letter.jpeg extension. Resizing here keeps the .jpeg extension; the editor adds the new size to the name (photo-1600x1200.jpeg), so rename the download if links or database rows expect the exact old filename.

JPEG Resize Quick Reference — Social Media and Web

####.jpeg vs.jpg — Does the Extension Matter?

Both extensions decode and re-encode identically. The editor keeps whichever extension your file had (it adds the new size to the name, e.g. photo-1600x1200.jpeg), so .jpeg-based workflows (CMS slugs, image-tag references, scan archives) keep their extension. Need to flip extensions or change format entirely? Try Resize JPG for the.jpg variant, or Convert JPEG to PNG and Convert JPEG to PDF to switch format.

Resize vs Crop vs Compress — Which Operation Do You Need?

Related tools: Crop JPEG for trimming, Compress JPEG for size-only reduction, Resize JFIF for the JFIF variant, and Resize PNG for transparent images.

Frequently Asked Questions

Is.jpeg different from.jpg when I resize?

No — they're the same format with two filenames. The JPEG standard (ISO/IEC 10918-1, 1992) doesn't specify an extension;.jpg only appeared because DOS and Windows FAT-16 capped extensions at three characters. xConvert reads either input identically and keeps whichever extension your file had, so "photo.jpeg" resized to 1600 × 1200 downloads as "photo-1600x1200.jpeg", not ".jpg". If you want to flip extension, just rename after download.

Does resizing a JPEG cause quality loss?

Downscaling preserves quality well because you're discarding pixels, not compressing tonal data — a 4000 × 3000 photo resized to 1600 × 1200 looks identical on a phone screen. However, JPEG always re-encodes on save, which adds one round of lossy compression. Keep "Quality" at 85 or more to make that re-encode invisible. Upscaling (making the image larger than the original) interpolates new pixels and softens detail — there's no way around it without AI upscalers.

What dimensions do I need for an Instagram post?

Instagram displays square feed posts at 1080 × 1080 px, portrait 4:5 posts at 1080 × 1350 px, and Stories/Reels at 1080 × 1920 px. Anything larger gets re-compressed by Instagram on upload; anything smaller looks soft on Retina screens. 1080 px on the short side is the sweet spot.

What's the right size for a US passport photo?

For online passport renewal and visa applications, the State Department's Digital Image Requirements specify a square JPEG between 600 × 600 px and 1200 × 1200 px, sRGB at 24 bits per pixel, and 240 KB or less. The physical equivalent is 2 × 2 inches at 300 DPI (= 600 × 600 px). Crop to square first so the head meets the 1 to 1 3/8 inch (25-35 mm) chin-to-crown rule, then resize and check the file size before uploading.

How do I resize a JPEG to an exact file size like 200 KB?

This editor has no file-size target: it sets the pixel size and the "Quality" slider (40–100). Resize first, lower "Quality" if the file is still too big, or run the result through Compress JPEG, which takes a target in KB or MB — useful for job-application uploaders, government e-forms and visa portals with a hard cap.

How do I keep the aspect ratio when resizing?

Leave "Keep aspect ratio" (the lock button) on and enter just one dimension — the other follows the source ratio. With a 4000 × 3000 source (4:3 ratio), entering Width = 1600 sets Height to 1200 automatically. Turning the lock off lets you force both numbers exactly, which stretches faces and logos when the source ratio doesn't match.

Can I resize many JPEGs to the same size at once?

Yes — drop up to 50 JPEG files at once (a mixed batch works too). The size, format and quality you set apply to every file in the batch; "Download all (.zip)" saves every resized result in one ZIP, and "Download one by one" saves them separately.

Does DPI matter when I resize?

DPI only matters for print; screens ignore it and draw by pixel count. This editor sets pixel size, not a DPI value, so work out the pixels you need instead: inches × 300 for photo prints (a 6 × 4 in print = 1800 × 1200 px), about 150 per inch for posters and banners seen from a distance, and the platform's pixel size for web and social. Your print or layout software then sets the DPI.

Are my files uploaded to a server?

Not for JPEG — that processes right in your browser, with nothing uploaded. Either way: no account, no sign-up, and the output is ready to download the moment processing finishes.