Translated text is overlapped and is merged into one line

Author: ninhthuanntntCreated May 13, 2026Updated May 13, 2026

Labelsbug

Before you submit

I have searched existing issues
I spent at least 5 minutes investigating and preparing this report
I confirmed this is not caused by a network issue
I have fully read and understood the README
I am certain that this issue is with BabelDOC itself and can be reproduced through the BabelDOC cli
I have uploaded the original file, or confirmed that this issue is unrelated to the original file
I have uploaded the log.
I confirm that the latest version of BabelDOC is being used.
I am aware that the issue section of this project is only for submitting bugs that are clearly related to the BabelDOC core, with complete reproduction steps and relevant logs attached.** Otherwise, issues will be closed directly.

Environment

markdown

- OS: MacOS Tahoe 26.4.1
- Python: Python 3.13.3
- BabelDOC: Latest Version

Describe the bug

I try to translate this PDF DGA.pdf

Using this command and got some issues below

uv run babeldoc --openai --openai-model "gemini-2.5-flash" --openai-base-url "xxx" --openai-api-key "xxx" --files ../DGA.pdf

Overlap issue

The translated text output for the first page is overlapped

Text in one line issue

The text should be separated into different lines, but it is merged into 1 line

Steps to Reproduce

Clone repository
Run command uv run babeldoc --openai --openai-model "gemini-2.5-flash" --openai-base-url "xxx" --openai-api-key "xxx" --files ../DGA.pdf
See error on the output PDF

Expected Behavior

The translated text shouldn't overlap
The multiline text shouldn't be merged into 1 line

Relevant Log Output or Screenshots

05/13/26 13:08:32] INFO     INFO:babeldoc.format.pdf.document_il.midend.automatic_term_extractor:Automatic Term Extraction: Starting term extraction for     automatic_term_extractor.py:358
                             document.                                                                                                                                                       
                    INFO     INFO:babeldoc.format.pdf.document_il.midend.automatic_term_extractor:Using 4 worker threads for automatic term extraction.       automatic_term_extractor.py:369
[05/13/26 13:08:55] INFO     INFO:babeldoc.format.pdf.document_il.midend.il_translator_llm_only:Found title paragraph: Dietary GuidelinesFor Americans          il_translator_llm_only.py:171
                    INFO     INFO:babeldoc.format.pdf.document_il.midend.il_translator_llm_only:Found first title paragraph: Dietary GuidelinesFor Americans    il_translator_llm_only.py:192
[05/13/26 13:09:05] WARNING  WARNING:babeldoc.format.pdf.document_il.midend.il_translator_llm_only:Translation result is the same as input, fallback.           il_translator_llm_only.py:778
                    WARNING  WARNING:babeldoc.format.pdf.document_il.midend.il_translator_llm_only:Fallback to simple translation. paragraph id: HaeR7          il_translator_llm_only.py:828
                    WARNING  WARNING:babeldoc.format.pdf.document_il.midend.il_translator_llm_only:Translation result is the same as input, fallback.           il_translator_llm_only.py:778
                    WARNING  WARNING:babeldoc.format.pdf.document_il.midend.il_translator_llm_only:Fallback to simple translation. paragraph id: jF1Wj          il_translator_llm_only.py:828
[05/13/26 13:09:42] INFO     INFO:babeldoc.format.pdf.document_il.midend.il_translator_llm_only:Translation completed. Total: 139, Successful: 137, Fallback: 2 il_translator_llm_only.py:255
[05/13/26 13:09:46] INFO     INFO:babeldoc.format.pdf.document_il.backend.pdf_creater:Font subsetting completed successfully                                              pdf_creater.py:1194
[05/13/26 13:09:48] INFO     INFO:babeldoc.format.pdf.document_il.backend.pdf_creater:PDF save with clean=True completed successfully                                     pdf_creater.py:1309
[05/13/26 13:09:51] INFO     INFO:babeldoc.format.pdf.document_il.backend.pdf_creater:PDF save with clean=True completed successfully                                     pdf_creater.py:1309
                    INFO     INFO:babeldoc.format.pdf.high_level:Peak memory usage: 1295.77 MB                                                                              high_level.py:351
                    INFO     INFO:babeldoc.format.pdf.high_level:finish translate: ../DGA.pdf, cost: 85.76081681251526 s                                                    high_level.py:628
                    INFO     INFO:babeldoc.format.pdf.high_level:No TOC found in the original PDF, skipping migration.                                                      high_level.py:694
translate                                              ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100/100 0:01:25 0:00:00
                    INFO     INFO:babeldoc.main:Translation results:                                                                                                              main.py:754
                                     Original PDF: ../DGA.pdf                                                                                                                                
                                     Total time: 85.76 seconds      


INFO     INFO:babeldoc.main:Prompt tokens: 45257                                                                                                              main.py:764
                    INFO     INFO:babeldoc.main:Completion tokens: 14237                                                                                                          main.py:765
                    INFO     INFO:babeldoc.main:Cache hit prompt tokens: 0                                                                                                        main.py:766
                    INFO     INFO:babeldoc.main:Term extraction tokens: total=15746 prompt=9459 completion=6287 cache_hit_prompt=0                                                main.py:769
                    INFO     INFO:babeldoc.format.pdf.high_level:Waiting for translation to finish...                                                                       high_level.py:315
                    INFO     INFO:babeldoc.format.pdf.translation_config:cleanup temp files: /var/folders/_q/rblpsyhx4g17l9dryg5nhlb80000gn/T/tmp2u3sgh88           translation_config.py:472

Original PDF File

DGA.pdf

Additional Context

I have tried many different config like --figure-table-protection-threshold 1, --split-short-lines --short-line-split-factor 0.6, --disable-rich-text-translate, --min-text-length 3, --enable-json-mode-if-requested but it still got error on the output pdf

Source: funstory-ai/BabelDOC

View original on GitHub View discussion on GitHub