Windows 11 Rename Of A Lot Of Files At Once With .Bat

[Curious]

How do I rename many files in a directory using a .bat file instead of doing it one by one with File Explorer?
I would appreciate the complete command because I haven't found anything good online and nothing I've seen has worked. It always gives the error: "Invalid syntax"
Thank you

 

[ChatGPT]

Here are working, copy‑paste batch (.bat) templates to rename many files at once. The #1 reason you see “Invalid syntax” is usually one of these:

• In a .bat file you must use double percent: %%F (not %F).
• If filenames/paths have spaces you must quote them: "%%F".
• ren can’t rename across folders in one command (new name must be just a name, not a full path).

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0) The simplest bulk rename (add a prefix to every file)​

Save this as rename_prefix.bat and run it inside the folder:

[USER=35331]@echo[/USER] off
setlocal rem Add a prefix to every file in the current folder:
for %%F in (*.*) do ren "%%F" "NEW_%%~nxF" endlocal

Example result: report.docx → NEW_report.docx

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1) Change extension for many files (e.g., .txt to .log)​

[USER=35331]@echo[/USER] off
ren "*.txt" "*.log"

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2) Replace text in filenames (e.g., replace spaces with underscores)​

This one uses delayed expansion (needed for string replace):

[USER=35331]@echo[/USER] off
setlocal EnableDelayedExpansion rem Replace OLD with NEW in filenames:
set "OLD= "
set "NEW=_" for %%F in (*.*) do ( set "name=%%~nxF" set "newname=!name:%OLD%=%NEW%!" if /I not "!name!"=="!newname!" ren "%%F" "!newname!") endlocal

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3) Rename with numbering (01, 02, 03... keeping original extension​

[USER=35331]@echo[/USER] off
setlocal EnableDelayedExpansion set /a n=1
for %%F in (*.*) do ( set "num=00!n!" set "num=!num:~-2!" ren "%%F" "!num!_%%~nxF" set /a n+=1) endlocal

Example: photo.jpg → 01_photo.jpg, next becomes 02_...

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4) Run it against a specific folder (drag & drop a folder onto the .bat)​

This version renames files in the folder you pass as the first argument:

[USER=35331]@echo[/USER] off
setlocal EnableExtensions set "TARGET=%~1"
if not defined TARGET set "TARGET=%cd%" pushd "%TARGET%" || ( echo Cannot open folder: "%TARGET%" exit /b 1) for %%F in (*.*) do ren "%%F" "NEW_%%~nxF" popd
endlocal

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Safety tip (dry-run first)​

To preview without renaming, change ren to echo ren, e.g.:
for %%F in (*.*) do echo ren "%%F" "NEW_%%~nxF"

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Quick question (so I give you the exact final command)​

What rename pattern do you want?
1) Add prefix/suffix? (what text)
2) Replace a word/character? (old → new)
3) Rename to sequential numbers only? (e.g., IMG_0001.jpg)
4) Filter by extension only? (e.g., only .pdf)
Post 2–3 example “before → after” filenames and I’ll tailor a single final .bat that matches exactly.

 

[Curious]

Hello,

He does'n wok fo any options you gave to me.

Hee is one example of a command I used in command Prompt:

First I put, befoe the command in the diectoy I have the files: "E:\DOWNLOADS\TEMP1>"

rename **001 - APOSTA EUROMILHÕES 056 - 15-07-2022 - SEM PRÉMIOS.pdf** 001.pdf

Response "The syntax of the command is incorrect"
Thank you

 

[ChatGPT]

The problem is your command line syntax: filenames with spaces (and special characters) must be in quotes. Also, if you literally typed the ** (bold markers), those are not valid in CMD and will break the command.

Correct command in Command Prompt (CMD)​

Run this exactly:
ren "001 - APOSTA EUROMILHÕES 056 - 15-07-2022 - SEM PRÉMIOS.pdf" "001.pdf"
(or rename instead of ren — same thing)

Why yours failed​

CMD splits parameters by spaces. So without quotes it reads it like:

• old name = 001
• extra tokens = -, APOSTA, EUROMILHÕES, …
  …which makes the syntax invalid.

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If it still errors, check these 3 common causes​

1) You’re not in the right folder​

Run:

cd /d "E:\DOWNLOADS\TEMP1"
dir

Confirm you can see the file listed exactly.

2) The filename is not exactly what you typed​

To avoid typos, use TAB completion:

1. Type:
   ren "001
2. Press Tab until the full filename appears.
3. Finish with:
   " "001.pdf"

3) 001.pdf already exists​

If a file called 001.pdf is already there, rename will fail (usually with a different message). Check:
dir 001.pdf

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If you want a .BAT that renames many files like that​

Tell me the rule you want, for example:

• “Rename each PDF to just the first 3 digits” (001.pdf, 002.pdf, …), or
• “Remove everything after the first ‘ - ’”, etc.

Post 3 examples of “before name → after name” and I’ll write the exact batch file for your case.

 

[Curious]

.BAT FILE

@echo on

setlocal enableDelayedExpansion

pushd e:\Downloads\Temp1

ren "013 - APOSTA EUROMILHÕES 036 - 05-05-2023 - SEM PRÉMIOS.pdf" "013.pdf"

endlocal

WITH THIS BAT DOES NOT WORK AND I CAN’T SEE THE ERROR DISPLAYED ANYWHERE

CMD PROMPT

E:\DOWNLOADS\TEMP1>ren "013 - APOSTA EUROMILHÕES 036 - 05-05-2023 - SEM PRÉMIOS.pdf" "013.pdf"

THIS COMMAND RUNS PERFECTY

 

[ChatGPT]

What you’re seeing is very typical: the command works in an interactive CMD window, but the .BAT “does nothing” because:
1) You copied forum formatting into the BAT
This line is not valid batch syntax:
[USER=35331]@echo[/USER] on
That’s WindowsForum BBCode. In a real .bat it must be exactly:
[USER=35331]@echo[/USER] on
(or @echo off)
2) When you double‑click a BAT, the window often closes immediately, so you don’t see the error.
You need a pause or run it from an already-open CMD.

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Fix: use this exact BAT (copy/paste)​

Open Notepad, paste this exactly, save as e.g. test-rename.bat:

[USER=35331]@echo[/USER] on
setlocal pushd "E:\Downloads\Temp1" || ( echo FAILED: cannot open folder pause exit /b 1) echo Current folder is:
cd echo Listing the exact filename:
dir /b "013 - APOSTA EUROMILHÕES 036 - 05-05-2023 - SEM PRÉMIOS.pdf" echo Renaming...
ren "013 - APOSTA EUROMILHÕES 036 - 05-05-2023 - SEM PRÉMIOS.pdf" "013.pdf"
echo ErrorLevel=%errorlevel% popd
endlocal
pause

Now double-click it. You will see what fails (folder not found, file not found, access denied, etc..

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Very important: save the BAT with the right encoding​

Because your filenames contain á/õ/É etc., Windows 11 Notepad often saves as UTF‑8, and CMD batch files can behave oddly with accented characters.
When you save the .bat:

• Notepad → File → Save As
• Save as type: All files
• Encoding: choose ANSI (or “Windows-1252” if your Notepad offers it)
• File name: test-rename.bat

This alone fixes many “works in CMD, fails in BAT” cases with accented filenames.

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Also verify you really saved a .BAT (not .BAT.txt)​

In File Explorer:

• View → Show → File name extensions
  Make sure it is test-rename.bat and not test-rename.bat.txt.

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One more quick test (best diagnostic)​

Open CMD, go to the folder, and run your BAT from there:

cd /d "E:\Downloads\Temp1"
test-rename.bat

If it errors, you’ll see the message and it won’t vanish.

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If you paste here the output shown by that BAT (it will list the file, then show the rename attempt + ErrorLevel), I’ll tell you the exact reason it fails on your machine.

 

[Curious]

Hello,

Anothe question now, please,

1 - I have some files in an Excel spreadsheet to rename, such as: STUNNING CLIFFS AT SUNSET.

2. How can I make an automatic change in Excel without doing it one by one to make it look like this?

3. ffmpeg -I "STUNNING CLIFFS AT SUNSET.MP4" " STUNNING CLIFFS AT SUNSET.MP4.AVI"

4 - Then I would just copy it to the .BAT file to RUN “ffmpeg -i” to convert everything at once.

5 - I have 113 files to do this.

 

[ChatGPT]

You don’t actually need Excel for this (a .bat can convert all .mp4 in a folder automatically), but I’ll show both ways:

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Important corrections first​

• In ffmpeg the input option is lowercase: -i (not -I).
• Your example output has a leading space before the filename: " STUNNING..." → remove that.

Correct example:
ffmpeg -i "STUNNING CLIFFS AT SUNSET.mp4" "STUNNING CLIFFS AT SUNSET.avi"

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Option A (Recommended): one BAT converts all MP4 in the folder​

Create convert_all_mp4_to_avi.bat like this:

[USER=35331]@echo[/USER] off
setlocal
pushd "E:\Downloads\Temp1" || (echo Folder not found & pause & exit /b 1) rem (Optional) overwrite output without asking:
rem add -y
for %%F in (*.mp4) do ( echo Converting: "%%F" ffmpeg -y -i "%%F" "%%~nF.avi") popd
endlocal
pause

• It will convert all *.mp4 in E:\Downloads\Temp1
• Output will be same name.avi

If you want AVI files in a subfolder:

mkdir "AVI" 2>nul
for %%F in (*.mp4) do ffmpeg -y -i "%%F" "AVI\%%~nF.avi"

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Option B: Use Excel to generate 113 ffmpeg command lines​

Step 1 — Put your base names in column A​

Example A2:
STUNNING CLIFFS AT SUNSET

Step 2 — In B2, generate the ffmpeg line​

Paste this formula into B2:
="ffmpeg -y -i """ & TRIM(A2) & ".mp4"" """ & TRIM(A2) & ".avi"""

• TRIM removes accidental leading/trailing spaces (very common).
• The """ pattern is how Excel outputs a literal quote ".

Fill down to B114 (or however many rows you have).

Step 3 — Copy Column B into a .BAT​

1. Copy the cells in column B (the generated commands).
2. Paste into Notepad.
3. Add at the top:

[USER=35331]@echo[/USER] off
pushd "E:\Downloads\Temp1"

1. Add at the bottom:

popd
pause

1. Save as: convert_list.bat

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One more caution (AVI is an old container)​

MP4 → AVI usually requires re-encoding and can increase file size. Your simple command will work, but if you get playback problems, tell me what codec the MP4 uses (H.264? H.265/HEVC? and I’ll give you the best ffmpeg settings for AVI.
If you want, paste 2–3 example rows from your Excel and confirm: are the names in Excel without extension (like your example) or do they already include .mp4?