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Learn and practise programming in your browser. Pick a language: write code, run it in a real terminal and follow the lessons step by step.
Why Shiklo Tools?
Simple, private tools that just work — right in your browser.
- Private Everything runs in your browser. Files are never uploaded.
- Secure Encrypted HTTPS connection, and nothing you open is stored on our servers.
- No login required No account, no sign-up, no email. Just open a tool and use it.
- Fast No upload or download wait — results appear instantly.
- Free All tools are free to use, with no limits.
- Works everywhere Phone, tablet or computer, in any modern browser.
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Frequently asked questions
Are my files or text uploaded anywhere?
No. Every tool runs inside your browser on your own device. Nothing you enter or open is sent to a server.
Do I need to create an account or log in?
No login is required. There are no accounts — open any tool and start using it straight away.
Are the tools really free?
Yes. All tools are free, with no limits or watermarks. The site is supported by ads.
Does it work on my phone?
Yes. The tools work in any modern browser on phones, tablets and computers.
Can I use the tools offline?
Once a tool has loaded it does its work on your device, so it keeps working even if your connection drops.
Which file types are supported?
PDF, Word, Excel, PowerPoint, OpenDocument and RTF documents, JPG, PNG, WebP, HEIC, AVIF, GIF and BMP images, MP4, MOV, WebM and MKV videos, MP3, WAV, M4A, OGG and FLAC audio, ZIP, 7z, RAR, TAR and GZIP archives, CSV, JSON, XML and plain text. Each tool lists exactly what it opens.
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Image Converter
Convert images between JPG, PNG, WebP, GIF and BMP — from JPG, PNG, WebP, AVIF, GIF, BMP or HEIC — one by one or in a batch. No upload.
Change the format of any picture in a few clicks: photos from an iPhone (HEIC) to JPG, screenshots to compact WebP, WebP images saved from websites back to JPG or PNG, logos to PNG with transparency, or images to GIF and BMP for older software. The Image Converter reads JPG, PNG, WebP, AVIF, GIF, BMP and HEIC and saves JPG, PNG, WebP, GIF or BMP.
Convert one image or drop a whole batch and download them together as a ZIP. Choose the quality for JPG and WebP, and the background colour that replaces transparency in formats that can't store it. Photos are turned the right way up using their EXIF orientation. The conversion runs in your browser with the same high-quality encoders as our other image tools — MozJPEG, libwebp and OxiPNG — and your images are never uploaded.
How to use Image Converter
- Choose or drop one or more images.
- Choose the format to convert to: JPG, PNG, WebP, GIF or BMP.
- Adjust the quality (JPG, WebP) or the background colour (JPG, GIF, BMP) if you like.
- Download each image, or all of them as a ZIP.
Features
- JPG, PNG, WebP, AVIF, GIF, BMP and HEIC in.
- JPG, PNG, WebP, GIF and BMP out.
- Batch conversion with download as ZIP.
- Quality slider for JPG and WebP.
- Background colour for formats without transparency.
- EXIF rotation applied; compare before and after.
- Runs in your browser: no upload, no watermark.
Choosing a format
Each format has a job it does best. When in doubt, use JPG for photos and PNG for screenshots, logos and anything with sharp edges or transparency.
| Format | Best for | Transparency | Size |
|---|---|---|---|
| JPG | Photos; sharing; printing | No | Small |
| PNG | Screenshots, logos, text, graphics | Yes | Large for photos |
| WebP | Websites: photos and graphics | Yes | Smallest of these |
| GIF | Simple graphics for old software (256 colours) | Background colour | Medium |
| BMP | Programs that need uncompressed bitmaps | No | Very large |
Quality and transparency
JPG and WebP are lossy: the quality slider trades file size against detail. 85 is a good default; 75 is fine for the web and 90–95 for printing. PNG is lossless, so it has no quality setting, and it is optimised automatically to stay as small as possible. JPG and BMP can't store transparency, so transparent areas get the background colour you choose (white by default); GIF here also uses that background. Converting never adds detail that the original didn't have — a small or heavily compressed JPG doesn't improve by saving it as PNG.
HEIC and AVIF
iPhones save photos as HEIC, and many websites now serve AVIF. Both are efficient modern formats that some programs and services still don't accept. The converter reads HEIC with libheif and AVIF with your browser's built-in decoder, and saves them as JPG or PNG that open everywhere. For AVIF images there is also a dedicated AVIF to JPG page, and for iPhone photos the HEIC to JPG tool, which can keep several photos from a single HEIC file.
Private batch conversion
Each image is checked by its content before converting, so a file that is not really an image — or a picture with dimensions so large it would freeze the browser — is refused with a clear message. Images are converted on your device using several workers in parallel, so batches finish quickly. Nothing is uploaded and no copy is kept. Use the Image Compressor if your goal is a smaller file in the same format, and the Image Resizer to change the dimensions.
Frequently asked questions
How do I convert an image to another format?
Drop the image, choose the format and download the converted file. Several images can be converted at once.
Which formats are supported?
JPG, PNG, WebP, AVIF, GIF, BMP and HEIC can be opened; JPG, PNG, WebP, GIF and BMP can be saved.
Are my images uploaded?
No. Everything is converted in your browser.
Can I convert HEIC photos from my iPhone?
Yes. They are decoded with libheif and saved as JPG, PNG or WebP.
Will converting reduce quality?
PNG is lossless. JPG and WebP use the quality you choose; 85 is visually very close to the original.
Can I save as AVIF?
Not yet — AVIF can be opened and converted to other formats.
What happens to transparent backgrounds?
PNG and WebP keep them. JPG, GIF and BMP fill them with the background colour you choose.
Related tools
Image CompressorCompress JPG, PNG and WebP images in your browser — up to 80% smaller with no visible loss. Batch, target size (e.g. under 100 KB), no upload.
Image ResizerResize JPG, PNG and WebP images by pixels, percent or print size — keep the aspect ratio, crop to fill, or pad. Social media presets. Batch, private.
AVIF to JPGConvert AVIF images to JPG (or PNG with transparency) in your browser — one image or a batch, with quality control. No upload.
HEIC to JPGConvert iPhone HEIC photos to JPG or PNG in your browser — perfect for Windows and Android. Batch, keeps quality, no upload.
WebP ConverterConvert WebP to JPG or PNG, and JPG, PNG or GIF to WebP — lossy or lossless, transparency kept. Batch, ZIP download, in your browser.
JPG to PNGConvert JPG images to PNG in your browser, with an option to make a white or coloured background transparent. Batch, lossless, no upload.