Free Image Converter: No Sign-up, and Nothing Is Uploaded
This image converter is free, needs no sign-up or login, and never uploads anything. Your pictures are opened and converted inside your browser, so they never leave your device, and the results carry no watermark. Drop in a photo, a screenshot, an icon or a whole folder of images, pick the format you need and download the result.
It covers the formats people actually run into: PNG, JPEG, WebP, AVIF, JPEG XL, GIF, APNG, BMP, ICO, TIFF, TGA, QOI and the Netpbm family (PBM, PGM, PPM). It can also read formats that browsers and many apps cannot open, such as HEIC from an iPhone, PSD, DNG raw previews, PCX and Windows CUR cursors, and turn them into something ordinary.
Beyond plain format swaps, images can be wrapped into a PDF, placed one per slide in a PPTX, converted from SVG to EPS or DXF, or traced from a raster image into SVG shapes. You can convert many files at once and download them together as one ZIP.
- Free
- No sign-up
- Never uploaded
- No watermark
Your files are converted on your device and never uploaded.
How to convert
- Drag your images onto the page, or use the file picker to choose one or many.
- Pick the target format, such as JPG, PNG, WebP or PDF.
- Adjust the options that appear for that format, for example quality for lossy formats.
- Press Convert and wait while your device does the work.
- Download a single result directly, or download a batch as one ZIP file.
- Check the result, and convert again with other settings if you want a smaller or sharper file.
Features
- Reads HEIC, PSD, DNG, PCX and CUR files that many apps cannot open.
- Writes PNG, JPG, WebP, AVIF, JPEG XL, GIF, APNG, BMP, ICO, TIFF, TGA, QOI, PBM, PGM and PPM.
- Turns images into a PDF, or a PPTX with one image per slide.
- Converts SVG to raster formats, EPS or DXF, and traces raster images into SVG.
- Keeps transparency whenever both the source and the target format support it.
- Converts many files in one go and packs them into a ZIP.
- Adds no watermark to any result.
- Works on phones, tablets and computers in any current browser.
Supported formats
| Format | Read | Write | Notes |
|---|---|---|---|
| PNG.png | Yes | Yes | Lossless raster format with a full alpha (transparency) channel. |
| JPEG.jpg | Yes | Yes | Lossy compression designed for photographs, so file sizes stay small. |
| WebP.webp | Yes | Yes | Supports both lossy and lossless compression, plus transparency and animation. |
| AVIF.avif | Yes | Yes | Built on the AV1 video codec; supports lossy and lossless images with transparency. |
| JPEG XL.jxl | Yes | Yes | Supports lossy and lossless compression, transparency and animation. |
| HEIC.heic | Yes | No | HEIC relies on the patent-licensed HEVC codec, so browsers cannot create it; it can be opened and converted to other formats. |
| GIF.gif | Yes | Yes | Limited to 256 colours per frame, with single-bit transparency. |
| APNG.apng | Yes | Yes | Animated PNG: keeps PNG’s lossless quality and full alpha channel for each frame. |
| BMP.bmp | Yes | Yes | Usually stores raw, uncompressed pixels, so files are large. |
| ICO.ico | Yes | Yes | Holds several sizes of one icon in a single file. |
| CUR.cur | Yes | No | CUR files carry a cursor hotspot, so they can be opened but not created; convert them to PNG or ICO. |
| TIFF.tiff | Yes | Yes | Flexible container, usually lossless, common in scanning, print and photography. |
| SVG.svg | Yes | Yes | XML-based vector format: shapes and paths stay sharp at any size. |
| PSD.psd | Yes | No | PSD is Adobe’s proprietary layered format, so it can be read as a flattened image but not created. |
| TGA.tga | Yes | Yes | Truevision TGA (Targa): simple lossless format with optional run-length compression. |
| QOI.qoi | Yes | Yes | The Quite OK Image format: lossless, designed for very fast encoding and decoding. |
| PCX.pcx | Yes | No | PCX is a legacy format that is only read here; convert it to PNG instead. |
| PBM.pbm | Yes | Yes | Netpbm black-and-white (1 bit) image. |
| PGM.pgm | Yes | Yes | Netpbm greyscale image. |
| PPM.ppm | Yes | Yes | Netpbm full-colour image. |
| DNG.dng | Yes | No | DNG holds raw sensor data; the embedded preview can be read, but a DNG cannot be created. |
| PDF.pdf | Yes | Yes | Fixed-layout document format that looks the same on every device. |
About the formats
Lossless and lossy formats
PNG, BMP, TGA, QOI, APNG and the Netpbm formats are lossless: every pixel is stored exactly. TIFF is usually lossless too. JPEG is lossy by design, and HEIC is lossy as well. WebP, AVIF and JPEG XL can be either, depending on the settings used when the file was made.
Converting from a lossy format to a lossless one does not bring back detail that was already thrown away. It only stops further loss. Converting from lossless to lossy shrinks the file but discards some information, so keep your original.
Transparency
PNG, WebP, AVIF, JPEG XL, GIF, APNG, ICO, TIFF, TGA, QOI and SVG can hold transparency. JPEG cannot, and neither can plain BMP, PBM or PGM output. When a transparent PNG, WebP, GIF or SVG is converted to JPG or BMP, the see-through areas become white.
GIF only has single-bit transparency: a pixel is either fully visible or fully clear, so soft edges turn hard.
Animation
GIF, APNG, WebP, AVIF and JPEG XL can hold animation, and SVG can be animated too. GIF is limited to 256 colours per frame, so photographic clips look grainy. Many tools show only the first frame of an APNG, so check where it will be used before choosing it.
HEIC, PSD, DNG, PCX and CUR
These five can be opened but not created. HEIC depends on the patent-licensed HEVC codec, so browsers cannot write it, but it converts to JPG, PNG and the rest. PSD is read as a flattened picture, so layers are not kept. A DNG is a raw photo file, and the embedded preview is what gets converted. PCX is a legacy format read only, and CUR cursors carry a hotspot that cannot be recreated.
One-time engine downloads
Most pairs use your browser directly. Some need a small WebAssembly codec, fetched once and kept by your browser: HEIC about 1.7 MB, JPEG XL about 1.1 MB, and AVIF about 1.5 MB when your browser cannot encode AVIF itself. Only the codec is downloaded, never your file.
Vector and PDF conversions
SVG is a vector format, so it stays sharp at any size and is converted to a raster image when you need PNG, JPG or WebP. Going the other way, tracing a PNG, JPG, WebP, BMP, GIF, AVIF or TIFF into SVG approximates fine detail, photos and gradients, so it suits logos and line art far better than photographs. EPS output is basic, and DXF output holds only 2D outlines.
Converting images to PDF places them on pages, and a PDF can be converted back to PNG, JPG or WebP with one image per page.
Privacy: how it works
- Your images stay on your device. The page reads each file with the browser's file API, converts it with code running in the tab, and hands the result back as a download. No upload happens, so there is no copy of your file on our servers to protect, delete or leak.
- There is nothing to sign up for and no login. The converter does not ask for an email address, and it does not need to know who you are to do its job.
- Some conversions use a WebAssembly engine that your browser downloads once, the first time you need it. Only the engine is fetched, never your file, and the page shows the approximate size before it starts. Your browser caches it, so later conversions skip the download.
- You can check the claim yourself: open your browser developer tools, watch the Network tab while a file converts, and you will see no request that carries your file.
- Photos often carry hidden details such as the place and time they were taken. Because nothing is uploaded, this tool never hands those details to anyone. If you plan to share the converted file, check where it will go, since a converted copy can still contain such information.
Tips
- For photos shared on the web, JPG or WebP at a moderate quality setting gives small files that look fine on screen.
- For screenshots, logos and anything with sharp edges or text, choose PNG so edges stay crisp.
- Keep your original file. Every lossy save throws away a little more detail, so convert from the original rather than from a copy.
- If a site rejects an iPhone photo, convert the HEIC to JPG.
- For a website favicon, convert a square PNG to ICO.
- For short animated clips from a video, use the video converter to make a GIF or animated WebP instead.
- Convert in smaller batches on an older phone, and close other heavy tabs if a big batch feels slow.
- Print shops and archives often want TIFF or PNG because both can be lossless.
Frequently asked questions
Is it really free?
Yes. There is no price, no trial, no credit card and no watermark added to your results. Ulkaa Tool does the conversion with your own device, so there is no server bill to pass on to you.
Are my files uploaded?
No. Your images are read and converted inside your browser and are never sent to Ulkaa or to anyone else. The result is created on your device and you save it from there. Some conversions load a small conversion engine the first time you use them. That download is the only network traffic, it contains no file of yours, and your browser keeps it for next time.
Do I need an account?
No. There is no sign-up and no login. Open the page, add your files and convert. An Ulkaa account is not needed for anything on this tool.
Is there a file size limit?
No limit is set by us. The real limit is your device: the conversion uses your own memory and processor, so very large files can be slow, and a very big batch may need to be split into smaller runs.