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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 Watermark
Add a text or logo watermark to photos — in a corner, centred or tiled across the picture — with size and opacity, one photo or a batch.
Protect your photos and show where they come from. The Image Watermark tool adds your name, website or copyright notice — or your logo — to pictures before you post them online, send them to clients or list them for sale. Put the watermark in any corner, along an edge or in the centre, or tile it diagonally across the whole picture so it can't simply be cropped off.
Set the size relative to the picture, so the watermark looks the same on small and large photos, choose its opacity and colour, and add a soft shadow so text stays readable on light and dark areas. Process a single photo or a whole batch with the same settings and download them as a ZIP. Each photo keeps its format. Everything runs in your browser — your photos are never uploaded.
How to use Image Watermark
- Choose Text or Logo image, then type your text or choose your logo (PNG with transparency works best).
- Set the size, the opacity and the position — or Tiled to cover the whole picture.
- Choose or drop the photos to watermark.
- Check the result with the compare view and download, one by one or as a ZIP.
Features
- Text watermark with colour and optional shadow.
- Logo watermark from PNG, WebP, SVG or JPG.
- Nine positions or tiled diagonally across the picture.
- Size relative to the photo; opacity from 10 to 100%.
- Batch processing with ZIP download; formats kept.
- Runs in your browser: no upload, no watermark of ours.
Choosing a watermark style
A watermark is a balance between protection and not spoiling the picture. Match the style to how much protection the image needs.
| Style | Settings | Good for |
|---|---|---|
| Discreet signature | Corner, size 6–10%, opacity 50–70% | Portfolios, social media, blogs |
| Visible branding | Logo in a corner, size 15–20%, opacity 80% | Product photos, real estate listings |
| Proof protection | Tiled text, size 8–12%, opacity 30–40% | Client previews, stock photo proofs |
| Centre stamp | Centre, size 25–40%, opacity 25–35% | Drafts and samples |
How the size works
The size is a percentage of the shorter side of each photo, so the same settings give the same look on a small phone photo and a large camera image. For text, it sets the letter height; for a logo, the logo width follows from it and its height keeps the logo's proportions. A small margin keeps corner watermarks off the edge. The tiled mode repeats the mark diagonally with spacing based on its size, covering the whole picture including the corners.
Tips for a good watermark
Use a PNG logo with a transparent background so only the logo itself appears. White text with a shadow reads well on most photos; dark text suits bright, plain backgrounds. Keep the opacity low enough that the picture still sells itself, but tile or centre the mark if people are likely to crop or edit it out. Keep your originals: a watermark is baked into the pixels of the copy and can't be removed again.
Formats and privacy
JPG photos are saved as high-quality JPG (quality 92), PNG stays PNG with its transparency, and WebP stays WebP; AVIF photos are saved as JPG. Each photo is checked by its content before processing, and very large images are refused before they could freeze the browser. The watermark is drawn on your device and nothing is uploaded or stored — your unpublished photos stay private.
Frequently asked questions
How do I add a watermark to a photo?
Type your text or choose a logo, set position, size and opacity, then drop your photos and download the watermarked copies.
Can I watermark many photos at once?
Yes. Drop them all; they get the same watermark and can be downloaded as a ZIP.
Can I use my logo?
Yes. Choose Logo image and pick a PNG, WebP, SVG or JPG file. A transparent PNG works best.
Are my photos uploaded?
No. The watermark is added in your browser.
Can a watermark be removed?
Not from the copy you download — it is part of the pixels. Tiled watermarks are the hardest to remove by editing.
Will my photos lose quality?
PNG stays lossless; JPG and WebP are saved at high quality (92).
Does it work on phones?
Yes, in current mobile browsers.
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Add Watermark to PDFAdd a text or image watermark to a PDF: choose colour, transparency, angle, size, centred or tiled, all or some pages. Free and private.
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.
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Background RemoverRemove the background from photos automatically with AI that runs in your browser. Brush to fix edges, new background, PNG download.