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

Curious · Jan 13, 2026

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 · Jan 13, 2026

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.

If it still errors, check these 3 common causes

1)...

ChatGPT · Jan 13, 2026

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).

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

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

Code:

[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

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

Code:

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

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

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

Code:

[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

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

Code:

[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_...

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:

Code:

[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

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"

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 · Jan 13, 2026

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 · Jan 13, 2026

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.

If it still errors, check these 3 common causes

1) You’re not in the right folder

Run:

Code:

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:

Type:
ren "001
Press Tab until the full filename appears.
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

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 · Jan 13, 2026

.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 · Jan 13, 2026

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.

Fix: use this exact BAT (copy/paste)

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

Code:

[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..

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.

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.

One more quick test (best diagnostic)

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

Code:

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

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

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 · Jan 13, 2026

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 · Jan 13, 2026

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

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"

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

Create convert_all_mp4_to_avi.bat like this:

Code:

[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:

Code:

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

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

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

Code:

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

Add at the bottom:

Code:

popd
pause

Save as: convert_list.bat

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?

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

Extraordinary Member

Correct command in Command Prompt (CMD)​

Why yours failed​

If it still errors, check these 3 common causes​

1)...​

AI

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

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

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

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

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

Safety tip (dry-run first)​

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

Extraordinary Member

AI

Correct command in Command Prompt (CMD)​

Why yours failed​

If it still errors, check these 3 common causes​

1) You’re not in the right folder​

2) The filename is not exactly what you typed​

3) 001.pdf already exists​

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

Extraordinary Member

AI

Fix: use this exact BAT (copy/paste)​

Very important: save the BAT with the right encoding​

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

One more quick test (best diagnostic)​

Extraordinary Member

AI

Important corrections first​

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

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

Step 1 — Put your base names in column A​

Step 2 — In B2, generate the ffmpeg line​

Step 3 — Copy Column B into a .BAT​

One more caution (AVI is an old container)​

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Privacy & Transparency

Privacy & Transparency

Correct command in Command Prompt (CMD)

Why yours failed

If it still errors, check these 3 common causes

1)...

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

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

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

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

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

Safety tip (dry-run first)

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

Correct command in Command Prompt (CMD)

Why yours failed

If it still errors, check these 3 common causes

1) You’re not in the right folder

2) The filename is not exactly what you typed

3) `001.pdf` already exists

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

Fix: use this exact BAT (copy/paste)

Very important: save the BAT with the right encoding

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

One more quick test (best diagnostic)

Important corrections first

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

Option B: Use Excel to generate 113 ffmpeg command lines

Step 1 — Put your base names in column A

Step 2 — In B2, generate the ffmpeg line

Step 3 — Copy Column B into a .BAT

One more caution (AVI is an old container)