Free tools
Small tools that do one thing well
27 free utilities for links, QR codes, campaigns and the everyday work around them. Most run entirely in your browser. MASK is what you use when the result needs to live somewhere.
Most used
- Link ShortenerTurn a long URL into a short one you can share anywhere.Links & URLs
- QR Code GeneratorMake a QR code for any link, ready to download.QR codes
- QR Code DesignerStyle a QR code with your colours, shapes and logo.QR codesNo sign-up
- Wi-Fi QR Code GeneratorNewLet guests join your Wi-Fi by scanning instead of typing the password.QR codesNo sign-up
- UTM BuilderTag a campaign URL so your analytics can tell where traffic came from.MarketingNo sign-up
- Ad Metrics CalculatorNewWork out CTR, CPC, CPM, CPA, ROAS and ROI from the numbers you already have.MarketingNo sign-up
- Bio Link BuilderBuild the one link that holds all your other links.Social & creator
- WhatsApp Link GeneratorMake a click-to-chat link with the first message already written.Social & creatorNo sign-up
- Image ResizerNewResize an image to the shape you need, without uploading it.ImagesNo sign-up
- JSON Formatter & ValidatorNewFormat messy JSON, or find out exactly where it breaks.DeveloperNo sign-up
27 tools shown
Links & URLs
Build, shorten and control the links you share.
- Link ShortenerTurn a long URL into a short one you can share anywhere.Links & URLs
- Bulk Link ShortenerShorten up to 100 URLs at once instead of one at a time.Links & URLs
- Smart Link BuilderSend iOS, Android and desktop visitors to different destinations.Links & URLs
- Expiring Link GeneratorShare a link that stops working after a date or a click limit.Links & URLs
- URL Encoder & DecoderNewPercent-encode or decode a URL component without guessing the rules.Links & URLsNo sign-up
QR codes
Generate and style QR codes for print and screen.
- QR Code GeneratorMake a QR code for any link, ready to download.QR codes
- QR Code DesignerStyle a QR code with your colours, shapes and logo.QR codesNo sign-up
- Bulk QR GeneratorGenerate a batch of QR codes from a list of links in one go.QR codesNo sign-up
- Wi-Fi QR Code GeneratorNewLet guests join your Wi-Fi by scanning instead of typing the password.QR codesNo sign-up
- vCard QR Code GeneratorNewPut your contact details on a card people can scan to save.QR codesNo sign-up
Marketing
Tag campaigns and work out what the numbers mean.
- UTM BuilderTag a campaign URL so your analytics can tell where traffic came from.MarketingNo sign-up
- Campaign PlannerKeep UTMs consistent across every link in one campaign.Marketing
- Ad Metrics CalculatorNewWork out CTR, CPC, CPM, CPA, ROAS and ROI from the numbers you already have.MarketingNo sign-up
- Engagement Rate CalculatorNewMeasure engagement against followers, reach or impressions — and say which you used.MarketingNo sign-up
Social & creator
Everything that goes in a bio, a post or a profile.
- Bio Link BuilderBuild the one link that holds all your other links.Social & creator
- Social Profile Link BuilderBuild clean, correct links to any social profile.Social & creator
- WhatsApp Link GeneratorMake a click-to-chat link with the first message already written.Social & creatorNo sign-up
- Email Signature GeneratorBuild an HTML signature that survives being pasted into a mail client.Social & creator
- Link Preview CheckerSee how your link will look when someone shares it.Social & creator
- Character & Word CounterNewCount characters, words and lines before you hit a limit.Social & creatorNo sign-up
Images
Resize and prepare images without uploading them anywhere.
Developer
Small, exact utilities that run entirely in your browser.
- JSON Formatter & ValidatorNewFormat messy JSON, or find out exactly where it breaks.DeveloperNo sign-up
- Base64 Encoder & DecoderNewEncode or decode Base64 text without mangling non-English characters.DeveloperNo sign-up
- Unix Timestamp ConverterNewTurn an epoch number into a date, and a date back into an epoch.DeveloperNo sign-up
- UUID GeneratorNewGenerate version 4 UUIDs from your browser's cryptographic randomness.DeveloperNo sign-up
- Hash GeneratorNewCompute a SHA-256, SHA-384 or SHA-512 digest of any text.DeveloperNo sign-up
Files & data
Convert between the formats that spreadsheets and APIs speak.
The tools are free. MASK is where the results live.
A link you can re-point after sharing it. A QR code you can change once it is printed. A bio page that holds everything, on your own domain — with the numbers to show what people actually clicked.