Image Resizer — resize JPG / PNG / WebP by pixels, percent, or preset, in your browser

Real-world use cases

• Shrink a 4K phone shot down to a 200×200 platform avatar

  Your new job's HR portal accepts avatars at exactly 200×200 and you only have a 4032×3024 selfie from your phone. Drop the file in, hit the "Thumb 200×200" preset, switch format to JPEG and quality to around 88. The preview shows the original dimensions next to the new dimensions and the final byte count — usually 15-25 KB instead of the original 4 MB. Download, upload, done. If the portal also enforces a square crop, leave the aspect lock off so the preset's 1:1 dimensions land exactly.

• Hit WeChat Official Account's 2.35:1 cover image slot

  WeChat's article cover image is rigidly 900×383 (≈ 2.35:1) and the editor rejects anything off by a few pixels. Take your source banner, pick "Custom W × H", type 900 and 383, turn off the aspect lock so WeChat gets the exact pixels it asks for. Export as JPEG at quality 90 — the file typically lands under 200 KB which is well inside WeChat's upload ceiling. The dimensions readout next to each row confirms you actually got 900×383 and not 901×384 from a rounding glitch upstream.

• Get a 5 MB resume photo under the 2 MB application cap

  Most government and university application forms cap photo uploads at 2 MB and a stubborn 5 MB DSLR JPEG will be silently rejected. Don't lower resolution if you don't need to — instead drop the photo in, keep the original dimensions (mode = By percent, 100%), switch format to JPEG and slide quality from 95 down to about 82. The per-row byte count updates after each resize, so you can step quality down a notch at a time until you cross under 2 MB without going overboard.

• Generate three aspect ratios for one Xiaohongshu post in one pass

  Xiaohongshu rewards posts that use 1:1, 3:4, or 4:3 cover images differently in the feed, and you want all three from one master shot. Drop the same image in three times, set mode = Custom for each row: 1080×1080, 1080×1440, 1440×1080, aspect lock off so you get the exact pixels. Hit Resize, then Download all (zip) — you get one zip with three ready-to-post variants named by their dimensions, no re-uploading the same source three times.

• Produce a pixel-perfect 1200×675 WordPress featured image

  A lot of WordPress themes (the GeneratePress / Astra family especially) hard-code 1200×675 for featured images and anything else gets cropped weirdly in the card layout. Drop your hero photo in, pick Custom W × H, type 1200 and 675, lock off. Export as WebP at quality 82 — usually 80-150 KB, which keeps the LCP element tiny without visible artifacts. The "Resized" column confirms the exact 1200×675 result before you upload to the media library.

Common pitfalls

• Stretching an image by entering Custom W × H with aspect lock off when you actually wanted to fit. The image will distort visibly — faces stretch, logos squash. Keep the lock on unless you're filling a pixel-exact slot that genuinely needs both dimensions.

• Trying to upscale a small image to 4K and expecting it to look sharp. Canvas resampling can only redistribute existing pixels, not invent detail — a 200×200 logo blown up to 1920×1920 will be soft and blocky. For upscaling you need an AI super-resolution tool, not a resizer.

• Resizing a JPEG, saving it, resizing the result, saving again. Every JPEG re-encode loses a little quality (generation loss) and the artifacts stack. Always resize from the original file, not from a previously resized copy.

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