Which to use
“auffüllen” and “ausfüllen” are a confusable German pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #26,306
- “auffüllen” frequency rank
- #10,810
- “ausfüllen” frequency rank
- 37116
- confusion score
Side-by-Side Comparison
| Feature | auffüllen | ausfüllen |
|---|---|---|
| Definition | ein (leeres) Behältnis (erneut) mit einer bestimmten Substanz voll machen | ein Formular ergänzen |
Where the eye mixes auffüllen and ausfüllen
Muted = shared; highlighted = the visual trap. They share 8 letters in sequence. auffüllen and ausfüllen follow the identical consonant-vowel pattern (VVCCVCCVC). Same shape at a glance is often the real trap, independent of shared letters.
Look-alike desk: auffüllen vs ausfüllen
A purely visual mix-up. auffüllen ([ˈaʊ̯fˌfʏlən]) and ausfüllen ([ˈaʊ̯sˌfʏlən]) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by a single letter - f in “auffüllen” becomes s in “ausfüllen”. Our composite confusion score for this pair is 37116, derived from the frequency rank of both members and their visual similarity.
auffüllen is recorded at frequency rank #26,306, classified as averb, pronounced [ˈaʊ̯fˌfʏlən]. ausfüllen is at rank #10,810, tagged as averb, pronounced [ˈaʊ̯sˌfʏlən].
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 37116, this pair ranks #1,598,438 of 2,006,359 scored German confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of auffüllen vs ausfüllen
Shared letters: aeflnuü. Private to "auffüllen": -. Private to "ausfüllen": s.
"auffüllen" · 9 letters · shape VVCCVCCVC · "ausfüllen" · 9 letters · shape VVCCVCCVC
Frequently Asked Questions
Do "auffüllen" and "ausfüllen" mean the same thing in a sentence?
In ordinary German text, does "auffüllen" or "ausfüllen" show up more?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "auffüllen" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "ausfüllen" - compare definitions side by side with the headword page. Word entry
- This pair ranks #1,598,438 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
- "auffüllen" and "ausfüllen" also get mixed up with nearby pairs, the highest-scored neighbour is "ausfüllen vs ausrollen". Nearby pair
Confusion rank #1,598,438 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.