Image compressor — shrink JPEG, PNG & WebP in your browser

Why smaller images matter

Oversized images are the most common reason web pages feel slow, and page speed feeds directly into search ranking and conversion. Email providers cap attachments around 20–25 MB, marketplaces and CMSs enforce per-file limits, and application forms routinely reject photos over 1–2 MB. Compressing before you upload solves all of it without touching how the image looks.

A quick rule of thumb: photographs belong in JPEG or WebP, graphics and screenshots with sharp text belong in PNG — or better, WebP, which handles both well at a fraction of the size. For web use, resize to the largest size the image will actually be displayed at, then compress at quality 80.

Compressing to a target size — 100 KB, 200 KB, 1 MB

Many uploads come with a hard cap: visa and job applications often want photos under 100 KB, marketplaces under 200 KB, CMSs under 1 MB. The reliable route to a target is resize first, then quality: a portrait capped at 1000 px on the long side lands under 100 KB at quality 70 in most cases, and a 1920 px photo at quality 75 sits comfortably under 500 KB. Watch the live size next to each image and nudge the slider down in steps of 10 until you are under the limit — each step is roughly a 15–25% saving.

Frequently asked questions

Are my images uploaded to a server?

No — and that is the main difference from most online compressors. Your images are read, compressed and re-encoded by your own browser using the canvas API. They never leave your device, which also makes it safe for ID scans, contracts and client work.

How much smaller will my images get?

Photos (JPEG) at quality 80 typically shrink 40–70% with no visible difference at normal viewing sizes. PNG screenshots compress little as PNG — converting them to WebP (a Pro feature) routinely cuts 60–90%. If re-encoding can't beat the original, the tool keeps your original bytes rather than handing back a bigger file.

What quality setting should I use?

80 is the sweet spot for photos going on the web: big savings, no visible artifacts. Use 90+ for images with fine text or sharp edges, and 60–70 when the smallest possible file matters more than close-up detail.

Why resize images at all?

A 4,000-pixel-wide photo displayed in a 800-pixel slot wastes most of its bytes. Capping the longest side at 1920 px (Pro) is usually the single biggest saving for web images — far bigger than the quality slider alone.

What does Toolizto Pro add to the image compressor?

The free tier compresses up to 3 images at a time with the quality slider — enough for everyday use. Pro ($9.99/month or $79.99/year, covering every Toolizto tool) removes the batch limit, adds JPEG/WebP/PNG conversion, resizing to a maximum dimension, a one-click ZIP of the whole batch, and removes ads.