Compress, Convert, and Resize Images Without Signing Up

Images are responsible for roughly half the weight of the average web page. Not JavaScript, not CSS — images. And yet the tools most people reach for when they need to compress a photo, convert a PNG to WebP, or resize something for a specific platform all want an account before you can touch a slider.

That’s a bad trade for a five-second task.

There’s a whole category of image tools that work entirely in your browser, process files client-side without uploading them to a server, and require nothing more than opening a tab. Some are built by Google. Some are single-developer projects with millions of monthly users. All of them are free and work without signup.

Why Format Choice Matters More Than You Think

Most people compress images without thinking about format. They have a JPEG, they make it smaller, done. But format selection often matters more than the compression setting itself.

WebP — a format developed by Google — produces files roughly 25–34% smaller than JPEG at equivalent visual quality. AVIF, the newer format backed by Netflix and the Alliance for Open Media, can reduce file sizes by up to 50% compared to JPEG. Both formats are now supported by all major browsers. If you’re optimizing images for a website, switching from JPEG to WebP alone can cut your payload by a third before you even adjust a quality slider.

This is why a tool that handles format conversion alongside compression is more useful than one that only squishes your existing JPEG. For most web work, the answer is: convert to WebP, compress to around 80% quality, and you’re done. Two no-login tools make that trivially easy.

Squoosh: The One to Reach for First

When you need to compress an image with real control over the output, Squoosh is the strongest option in this space. It’s a Google-built open-source tool that runs entirely in WebAssembly — your file never leaves your browser.

The workflow is a side-by-side comparison view: original on the left, compressed preview on the right. Pick an output format (MozJPEG, WebP, AVIF, JPEG XL, PNG, OxiPNG, and more), drag a quality slider, and watch the size estimate update in real time. The difference display shows exactly how many kilobytes you’re saving as a percentage of the original.

What makes Squoosh better than most alternatives is that it doesn’t oversimplify. You can adjust chroma subsampling, choose encoding speed, and tweak advanced codec settings if you know what those do. Or ignore all of that and just move the quality slider. Either way, you get a live preview before you commit — which is rare in no-login tools.

It also handles resizing: width and height with optional aspect-ratio lock, and multiple scaling algorithms (Lanczos for sharpness, Mitchell for photos that look slightly ringing at edges). See the Squoosh listing on nologin.tools for the full capability list. The one limitation: it processes one image at a time, which is friction if you have a folder of 50 photos.

TinyPNG: Fast and Completely Hands-Off

TinyPNG solves the batch problem. Drop up to 20 images at once (up to 5MB each, no account required) and it compresses them using lossy optimization that selectively reduces the color palette in ways most people can’t see. PNG files typically shrink 60–80%. JPEG and WebP are supported too.

The experience is a drag-and-drop box, a progress bar, and a download link. Nothing to configure. That’s a design choice — the algorithm makes the decisions for you, and it’s good enough that you probably won’t second-guess it.

Unlike tools that require signup for batch processing, TinyPNG’s 20-file limit applies per batch, not per day. Drag another 20 images when the first batch finishes. For photographers prepping a gallery before upload, or developers clearing image assets before a deploy, that workflow holds up without ever touching an account.

The same compression quality the browser version uses is available as a developer API and WordPress plugin — but the web version is the free no-login option. The TinyPNG profile on nologin.tools covers what’s included in the free tier versus the paid plan.

ezGIF: More Than Its Name Suggests

The name undersells it. ezGIF is one of the most feature-rich image tools available without any account, and it handles far more than animated GIFs.

For GIF work: create from a video file or image sequence, optimize frame timing, reduce colors, crop, resize, reverse, add text. The GIF optimizer is especially useful — animated GIFs are infamously large, and ezGIF’s optimization typically cuts them 30–40% without visible quality loss.

But the tool list extends beyond GIFs. There’s a JPG/PNG/WebP optimizer, a resizer that handles percentage-based or pixel-specific dimensions, a format converter (supports AVIF, HEIC, BMP, TIFF, and others that many “modern” alternatives quietly skip), an image-to-PDF converter, and a sprite sheet cutter for CSS sprite work.

The interface is utilitarian — tabs across the top, an upload box, results below. It hasn’t been redesigned since around 2014 and it shows. But every feature works, and the file type support is unusually broad: HEIC from iPhones, TIFF from scanners, AVIF from newer cameras. If a format exists, ezGIF probably handles it. Full profile at ezGIF on nologin.tools.

Convertio and SVGOMG: The Edge Cases

Some format conversions are obscure enough that most tools don’t support them. Convertio covers 300+ file formats across images, documents, audio, and video. For image work specifically: it handles RAW camera formats (CR2, NEF, ARW), DDS (game textures), TGA, EXR (HDR format from VFX pipelines), and others that specialized tools skip.

Free conversions without signup are limited to a reasonable daily cap and 100MB per file. Files are uploaded to Convertio’s servers (unlike Squoosh’s client-side processing), so for sensitive images, check their privacy policy before proceeding. For converting a product mockup from RAW to JPG or an icon from SVG to ICO, it’s fine. For anything confidential, Squoosh’s local processing is the safer choice. See Convertio on nologin.tools.

SVG files are a different problem entirely. Design tools like Figma and Adobe Illustrator export SVGs loaded with editor metadata, redundant group elements, precision numbers out to 8 decimal places, and inline styles that could be attributes. SVGOMG is the browser-based frontend for SVGO — drop in an SVG and it strips the noise while showing a live preview. Typical savings on Figma exports run 40–70%. The toggle panel lets you disable individual optimizations if one breaks a specific SVG trick. No upload, no account, all local. Profile at SVGOMG on nologin.tools.

Which Tool for Which Job

Here’s the honest map, because these tools don’t compete with each other — they cover different needs:

The “files leave browser” column matters for privacy. Squoosh and SVGOMG never send your file anywhere — everything happens in WebAssembly or JavaScript in your tab. TinyPNG, ezGIF, and Convertio upload to their servers, process, and return results. All three have stated short retention periods (typically 24 hours or less), but you’re trusting their policy.

For most everyday tasks — compressing a product photo, resizing a header image, converting a JPEG to WebP — server-side processing is a fine tradeoff for the convenience and format support those tools provide. For medical images, legal documents, or anything personal you’d rather not have on a stranger’s server: Squoosh.

The tools that survive without locking you in tend to be the ones that are actually good. Squoosh is built and maintained by the Google Chrome team not as a product with a monetization plan, but as a reference implementation for modern image codecs. That alignment of incentives — “make image compression good for the web” — produces a better tool than “make users create accounts.”

According to HTTP Archive’s Web Almanac, WebP adoption on the web has grown significantly but JPEG and PNG still dominate. The gap between what modern browsers support and what most sites actually serve represents real performance left on the table. None of the tools to close that gap require you to hand over your email first.

The broader nologin.tools directory catalogs verified privacy-friendly tools across dozens of categories. The image tools section is one of the more complete corners — there’s no shortage of services that have figured out “no signup” is a feature, not a compromise.