Convert JPG, PNG, WebP, GIF, BMP & SVG · drag in hundreds at once · download as a ZIP. Processed locally on-device — No signup or watermark. File contents are processed locally in your browser for supported workflows.
Conversion runs on your computer's CPU & memory — large batches can slow your machine. Use at your own discretion.
ConvertUnlimited is a free image converter that runs entirely inside your browser. Drop in JPGs, PNGs, GIFs, WebPs, BMPs, or SVGs, choose an output format, and a converted copy is ready to download in seconds. file contents are not intentionally uploaded by this tool to a server: every image is decoded, redrawn, and re-encoded locally using your browser's HTML canvas API.
That browser-native model has two practical consequences. First, Selected file contents are processed locally in your browser, so file contents are not intentionally uploaded by this tool. Second, there are no per-user storage costs to subsidise, which is why we can offer it for free with no caps, no signup, and no watermark. The only operating cost is keeping the page online, and the privacy build removes ad code; public deployment costs must be funded separately.
Conversion uses your computer's CPU and memory. For most laptops, dragging in 30–80 photos at typical phone-camera resolutions feels instant. Very large batches — hundreds of high-megapixel images at once — will use more RAM and may slow your machine briefly while they encode. We suggest queuing roughly 50 images at a time as a comfortable middle ground, but the tool doesn't enforce a limit; use whatever your machine handles cleanly. See Tips for big batches for guidance on larger jobs.
Google's modern image format. At the same visual quality, WebP files are typically 25–35 % smaller than JPEG and 50 % smaller than PNG, and they support transparency. WebP is supported by every current browser, so it's the best default for the web. Choose WebP when you want maximum savings and your audience views images in a browser.
The universal photo format. JPEG is lossy (it discards information to shrink the file), doesn't support transparency, and is supported absolutely everywhere — email, social media, printers, decade-old phones. Choose JPEG for photos when you need maximum compatibility, or when you're embedding into a system you don't control.
Lossless and supports transparency. PNG is ideal for screenshots, logos, icons, and any image with sharp edges or solid-colour regions, because it compresses those without artefacts. The trade-off is file size: PNGs of photos are several times larger than the equivalent JPEG or WebP. Choose PNG when you need transparency or when image fidelity matters more than size.
An uncompressed bitmap format. BMPs are huge for what they store. There's almost never a reason to keep an image as BMP today — convert to WebP, JPEG, or PNG and save 80–95 % of the disk space.
The quality dropdown only applies to lossy formats (WebP and JPEG). PNG is lossless, so the dropdown is automatically disabled when PNG is selected. The four presets translate roughly to:
Original (1.0). Visually identical to the source for most images. Files are still smaller than the input because modern JPEG and WebP encoders are more efficient than older sources, but you give up almost no fidelity.
High (0.9). Negligible visual difference for most photos. Good default for hero images, photography, anything where quality matters.
Recommended (0.75). The sweet spot for web use. Files are typically 30–50 % smaller than High with no loss visible at normal viewing sizes. Use this for blog posts, product galleries, social media.
Compact (0.5). Aggressive compression. Best for thumbnails, image grids, or when you need to email a folder of photos and bandwidth is the bottleneck. You'll notice softness in fine detail, especially on text-heavy or high-contrast images.
A few things to know when you're converting more than a handful of files:
Batch size. We recommend up to ~50 images at a time as a comfortable starting point. Most laptops handle 100–200 photo-sized images without complaint, but past that, your browser may briefly hang while it allocates memory. If it does, just wait — it's not crashed, it's working.
RAM matters more than CPU. A 12-megapixel photo takes roughly 50 MB of RAM to decode. A batch of 100 such photos can momentarily peak at several gigabytes of memory. Closing other tabs helps if you hit the wall.
Mobile. Phones and tablets have less RAM and stricter background limits. Stick to smaller batches (10–20 images) on mobile devices.
Convert JPG, PNG, GIF, BMP, SVG, and WebP images in bulk — free, unlimited, no signup. Runs entirely in your browser. Download individually or as a ZIP. no watermark. File contents are processed locally in your browser for supported workflows.
Use the controls on this page, review the output in your browser, then download the result from this tab.
No software-imposed cap. The only ceiling is what your browser and computer can handle. We suggest about 50 images at a time as a comfortable starting point — most modern laptops handle two or three times that without trouble.
No. ConvertUnlimited runs entirely inside your browser using the HTML canvas API. Selected file contents are processed locally in your browser — file contents are not intentionally uploaded by this tool.
Briefly, yes. Each image decode and encode uses your CPU and RAM. Big batches (200+ high-resolution photos) can momentarily peak system memory. Use at your own discretion.
The privacy build does not include ads. Because file contents are not intentionally uploaded by this tool, there's no per-user storage bill — so we don't need a subscription model.
WebP is smallest at equivalent quality and supports transparency — best default for the web. JPEG is universal and best for photos when compatibility is the priority. PNG is lossless and supports transparency — best for screenshots, logos, and icons. The full breakdown is in our image format guide.
Lossy formats (WebP, JPEG) discard some information by design. At "High" or "Original" quality, the loss is invisible at normal viewing sizes. PNG is lossless — converting from PNG to PNG produces a bit-for-bit equivalent file.
Not currently. The browser canvas API only decodes image formats the browser natively supports. iPhone HEIC photos can be exported as JPEG from Photos.app and then converted here; PDFs need a dedicated PDF tool.
This happens occasionally when you convert from a more efficient format (for example, WebP) to a less efficient one (for example, PNG), or when you ask for "Original" quality on an already-compressed source. The tool always shows the before / after sizes so you can decide whether the conversion was worth it.
All current browsers — Chrome, Edge, Firefox, Safari, and their mobile variants. There is no extension or plugin to install.
No, and we don't think there needs to be — the browser does everything an app would, with no install or update step. Just bookmark this page.
Privacy build: This build removes ads, analytics, remote fonts, runtime CDN scripts, and file-operation telemetry. Selected files are processed in the browser using local JavaScript and browser APIs.
Selected images. ConvertUnlimited converts images entirely inside your browser. No file is ever uploaded to a server, and we never see, store, or transmit your images. File contents are not intentionally uploaded by this tool.
Contact. For privacy questions, reach out via the project's GitHub.
ConvertUnlimited is provided as-is, free of charge, for personal and commercial use. By using the site you agree to the following:
You are responsible for the images you convert, including ensuring you have the rights to use and process them. The tool is provided without warranty — we make a good-faith effort to keep it working, but we cannot guarantee uninterrupted availability or that any specific conversion will succeed. We are not liable for any data loss, hardware wear, or other indirect harm resulting from converting files locally on your device. If you find a bug or have a feature request, opening an issue on the project's GitHub is the best channel.
Use these English guides when you need format comparisons, converter alternatives, or browser-based workflow notes before choosing a tool.