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Predict how far UI strings grow in eight languages and flag the ones that overflow their space.

Localisation stress testFreeFor designers and developers

30/day

free runs a day, no sign-in.

Before: what you give it

The example input, as typed in. You paste text, CSS, markup or notes.

strings:
  Save | 8
  Cancel
  Welcome back, {name}!
  You have {count} new message(s)
  Delete selected items | 24
  Pay $12.99 by 03/04/2025
  Enter your email address to receive updates | 30
  Please check your connection and try again
  Hello, 
   of your account
  Ship to the right >
locales: de, fr, es, fi, ru, ja, ar, zh
defaultMaxChars: 30

After: what comes back

The first lines of a real run on that input. Nothing here is edited by hand.

11 strings checked for de, fr, es, fi, ru, ja, ar, zh. Likely overflow: 9. Tight: 1. With internationalisation problems: 5.

#1: "Save" (4 chars, limit 8; up to 10 chars: +200 to 300%)
  Predicted: de 16 (overflow), fr 14 (overflow), es 14 (overflow), fi 16 (overflow), ru 15 (overflow), ja 2, ar 13 (overflow), zh 2
  Pseudo-localised: [Šáṽé ~~~~~~~~~~~~]

#3: "Welcome back, {name}!" (21 chars, limit 30; 21 to 30 chars: +60%)
  Predicted: de 37 (overflow), fr 34 (overflow), es 34 (overflow), fi 37 (overflow), ru 36 (overflow), ja 11, ar 31 (overflow), zh 9
  Pseudo-localised: [Ŵéĺçöḿé ƀáçķ, {name}! ~~~~~~~~~~~~~~~~]

#4: "You have {count} new message(s)" (31 chars, limit 30; 31 to 50 chars: +40%)
  Predicted: de 48 (overflow), fr 44 (overflow), es 44 (overflow), fi 48 (overflow), ru 46 (overflow), ja 16 (width risk), ar 40 (overflow), zh 13
  Pseudo-localised: [Ýöü ĥáṽé {count} ñéŵ ḿéššáĝé(š) ~~~~~~~~~~~~~~~~~]
  - Hard-coded plural "message(s)": use plural forms (ICU or gettext). Russian has 3 forms, Arabic 6, Japanese 1.
... full output on the tool page

What you get

Predicted length per locale, overflow flags, a pseudo-localised string and internationalisation traps found

What it cannot do

Estimates from published expansion ratios, not translations; free tier reads up to 20,000 characters.

Who it is for

Designers
Developers

Free and Pro

Free	30 runs a day per IP address, up to 20,000 characters a run.
Pro	No daily limit, 300 requests a minute, up to 200,000 characters a run.

What each plan includes

Use it from your assistant

The tool is called stress_test_localisation. Connect the server once, then ask for it by name or just describe the job. Install steps for each app.

claude mcp add --transport http designers https://designers.allthepossibles.com/mcp

curl -X POST https://designers.allthepossibles.com/api/localisation-stress -H 'content-type: application/json' -d '{"strings":"Save | 8\nCancel\nWelcome back, {name}!\nYou have {count} new message(s)\nDelete selected items | 24\nPay $12.99 by 03/04/2025\nEnter your email address to receive updates | 30\nPlease check your connection and try again\nHello, \n of your account\nShip to the right >","locales":"de, fr, es, fi, ru, ja, ar, zh","defaultMaxChars":30}'

Try it here

The form starts with the same example input, so you can run it first and then swap in your own.

One UI string per line; add ' | 24' for a limitLocales (default de, fr, es, fi, ru, ja, ar, zh)Default max chars