Best Free Image Converter and Compression Tools

The page is not a codec encyclopedia. It is the short list for the jobs people actually hit in a week: a hero that is 5 MB, an iPhone HEIC Windows will not preview, a WebP a CMS refuses, an SVG that has to become a PNG at a known size, and the occasional thumbnail with type sitting behind a person.

What belongs on this list

The rule is boring on purpose. If DevOkk has a tool for a common image chore, and the chore is one file and one outcome, it is here. OCR, batch APIs, print-production color management, and “400 formats including PSD layers” are real products. They are not this page.

Pick by the failure in front of you, not by which card looks busiest. Compress when the file already opens and is just too fat. Convert when the next app cannot read the container. Rasterize an SVG when something downstream wants pixels. Put type behind a subject only when you actually want that poster look - it is not a compressor with extra buttons.

Shrink the file that already works

Online Image Compressor is the tool for a camera JPEG or a PNG screenshot that already displays everywhere and still wrecks a homepage. You get a quality slider (the useful range for web photos is usually 70–85), an optional max width and height, and a before/after size. A 4000-pixel phone photo destined for a 1200-pixel hero should be resized, not only squeezed. Squeezing a 12-megapixel file and serving it at full resolution is how you “compress” and still fail Largest Contentful Paint.

Use the compressor after a conversion if you just made a PNG from something huge. Use it first if the format is already fine. Keep the original until you have opened the small file on a phone. That check is the product, not a percentage badge.

When the problem is the container, not the pixels

Convert to JPG exists because a surprising number of forms, email clients, and older media libraries still want JPEG and will reject everything else with a useless error. Drop in a PNG, WebP, GIF, SVG, or HEIC (if this browser can decode it), set quality, download. JPG has no alpha channel. A logo with a hole becomes a logo on a white (or muddy) rectangle. That is expected. If you needed the hole, you opened the wrong hub.

Convert to PNG is the other direction: you need a still that editors, Figma, and a lot of “upload a sticker” flows will accept, and you may need transparency. PNG will not magically restore detail a lossy WebP or JPEG already discarded. It will stop you from stacking another JPEG encode while you crop. For screenshots with UI chrome, PNG is often smaller and sharper than a mid-quality JPG. For a photo of a street, it is usually larger for no visual win.

The dedicated paths under those hubs are for people who already know the source. HEIC to JPG is the AirDropped iPhone photo that shows a blank thumbnail in Explorer. SVG to PNG is the mark you keep as a vector in the repo and flatten only for GitHub, Slack, or an app-store slot that will not take SVG. Open those when you are done arguing about formats and just need the file.

Type behind a person, not a watermark

Text Behind Image is a different job. It cuts the subject (the library runs in the tab; the first run may fetch a model) and lets you park big type behind a head or a product so the letters duck under the silhouette. That is a YouTube thumbnail or a podcast square, not “compress my JPG.” A busy crowd, a tiny subject, or a flat product-on-white shot will confuse the cutout. If the mask is wrong, pick another photo. Do not spend an hour fighting hair.

Export, look at it at the crop YouTube or Instagram will actually apply, then send the PNG through the compressor if the upload cap is tight.

How the pieces chain

A realistic week is not one tool. An iPhone photo becomes JPG so a landlord portal will accept it, then gets compressed so the portal’s 2 MB limit stops yelling. A Chrome “Save image as” WebP becomes JPG for WordPress, or PNG if you are about to mask it. An SVG logo becomes a 512-pixel PNG for a manifest, and you leave the .svg in git.

Stay on image tools for the next hop. The failure mode is converting on DevOkk and then re-uploading the output to a clone that wanted the original anyway.

If you are still choosing JPG vs PNG vs WebP, read JPG vs PNG vs WebP before you click convert. If the file already opens and is just heavy, skip to how to compress images for the web.

What this list will not pretend

DevOkk is not Photoshop. It is not a DAM. It will not color-manage a print job or convert 40,000 SKUs overnight. Browser memory is a real ceiling; a 200 MB scan belongs on a desktop machine. HEIC support is only as good as the browser’s decoder. Animated GIFs become a still (usually the first frame) - that is a feature for a catalog thumbnail and a disappointment if you wanted a video.

If you need a format matrix the size of CloudConvert’s, use CloudConvert, and still think twice before dropping a passport scan into it. The comparison in DevOkk vs CloudConvert is about that split, not a scoreboard.

Open the one tool that matches the file on disk. Ignore the rest until the next failure.