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Lowercase Text File

Convert a UTF-8 text file to lowercase.

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Max 100 MB per file · TXT, TEXT, LOG

    Text options

    UTF-8 files only. Up to 300,000 characters per file.

    Your file is ready!

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    Free No watermark No sign-up Files never uploaded
    Strange characters?Save the file as UTF-8 first (Notepad: Save as → Encoding: UTF-8).
    Turkish text?Choose Turkish so I becomes the dotless ı.
    Cleaning email lists?Remove duplicates afterwards.

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    How to use Lowercase Text File

    1. Select your text files.Add UTF-8 text files up to 2 MB typed in caps lock, or email lists.
    2. Choose the text language.This keeps special letters correct when they become small letters.
    3. Click Lowercase Text File.Numbers, spaces, punctuation and line breaks are not changed.
    4. Check the text.Every letter should now be small.

    About Lowercase Text File

    When is it useful? Lowercase Text File changes all CAPITAL letters in a .txt file to small letters — handy for cleaning lists typed in caps lock, preparing email lists, tags and usernames, or making data consistent before sorting.

    Good to know: numbers, spaces, punctuation and line breaks are not changed. Choose the text language for correct results — in Turkish, I becomes the dotless ı. Scripts without capital letters, such as Hindi, Kannada, Telugu and Tamil, stay the same. The file must be UTF-8 and up to 2 MB.

    Tips for Better Results

    • Use Remove Duplicate Lines after lowercasing to find repeated email addresses.
    • Save the file as UTF-8 before uploading.
    • Lowercasing cannot be undone exactly — keep your original file.

    Frequently Asked Questions

    Why lowercase an email list?
    Many tools treat Name@Example.com and name@example.com as different. Lowercase first, then remove duplicates.
    What happens to Turkish capital I?
    Choose Turkish as the language so I becomes the dotless ı.
    Can lowercasing be undone?
    Not exactly — keep your original file.
    Works with: Notepad · TextEdit · VS Code · Excel imports · most text editors

    What converts well, and what doesn't

    In your fileAfter lowercase
    CAPITAL lettersBecome small letters
    Numbers, spaces, punctuation, line breaksNot changed
    Hindi, Kannada, Telugu, TamilStay the same
    Text languageChoose it for correct results
    UndoNot exact — keep your original
    💡 Tip: Use Remove Duplicate Lines after lowercasing to find repeated email addresses.

    Common uses

    Caps lock listsClean them up.
    Email listsConsistent addresses.
    TagsLowercase tags.
    UsernamesPrepare usernames.
    SortingConsistent data first.
    Data clean-upUniform text.

    Is my file safe?

    Browser processing: your files are processed on your own device and are never uploaded to our server.

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    Guide

    Lowercase Text File: a complete guide

    When small letters are better

    Text typed with Caps Lock on, lists copied from old systems, email addresses, usernames, website tags and keywords are easier to use and compare when everything is in lowercase. Many databases and email tools treat “Name@Example.com” and “name@example.com” differently in sorting and duplicate checks.

    How it works

    Upload a UTF-8 .txt file of up to 2 MB, choose the text language, and every capital letter is changed to its small form using that language's rules. Numbers, spaces, punctuation and line breaks are unchanged, and you download a new text file.

    Language details

    In Turkish, I becomes the dotless ı and İ becomes i, which differs from English rules — choose Turkish for Turkish text. Greek final sigma and other special cases follow the selected language. Scripts without letter case, such as Hindi, Kannada, Telugu and Tamil, stay the same.

    Common problems and how to fix them

    Names and sentence starts lost their capitals: lowercasing applies to all letters — use it for lists, emails and codes rather than normal prose. “Not valid UTF-8”: save the file as UTF-8 first. Duplicate entries remain: run Remove Duplicate Lines after lowercasing.

    Good habits

    Lowercase email lists before removing duplicates, keep the original file, and check a few lines after converting.

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