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 preserves whichever extension you uploaded, so a file named "photo.jpeg" stays "photo-resized.jpeg" rather than getting silently renamed. 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 the Quality Preset at High or Highest (roughly 85-95%) 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?

Under Image Compression, pick "Specific file size" and enter your target in KB or MB. The tool then adjusts quality and resolution together until the output lands at or under your number. This is useful for job-application uploaders, government e-forms, and online visa portals that reject files above a specific KB cap.

How do I keep the aspect ratio when resizing?

Use Width-only or Height-only mode — enter just one dimension and the other auto-fills proportionally. With a 4000 × 3000 source (4:3 ratio), entering Width = 1600 sets Height to 1200 automatically. Switching to full Width × Height forces both numbers exactly, which stretches faces and logos when the source ratio doesn't match.

Can I resize hundreds of JPEGs to the same size at once?

Yes. Upload a batch and one width/height (or percentage) applies to every file. Aspect-ratio-preserving modes keep each photo proportional, so a mix of portrait and landscape shots all fit within your target box without distortion. Output downloads as a ZIP.

What DPI should I pick — 72, 300, or higher?

DPI only matters for print; on-screen, the browser ignores it and renders by pixel count. Use 72 or 96 DPI for web and social media, 300 DPI for photo prints and most commercial printing, and 600 DPI for fine-art reproduction or archival scans. Changing DPI without changing pixel count just relabels the print size — it doesn't add detail.

Are my files uploaded to a server?

JPEG resizing runs on our servers over an encrypted connection, and your files are deleted automatically after a few hours — no account, no sign-up. That makes it safe for ID documents, draft mockups, and anything else you'd rather not leave on a third-party cloud. Your output is ready to download the moment processing finishes.

Resize JPEG

Resize JPEG images to exact dimensions, percentage, or standard presets. Adjust quality and download instantly.

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