How to Batch Rename Thousands of Photos by Client and Date

Six months after the wedding, the couple emails: they want the photo by the lake, just after the ceremony. You open the folder and find 2,000 files called IMG_4821 and DSC_0007, from two cameras that both counted from 0001, plus a phone’s worth of HEIC files. Last month’s client has the same file names.

Now the same folder after one batch rename:

IMG_4821.HEIC  →  2026-03-14_hartley-wedding_142305.heic
DSC_0007.NEF   →  2026-03-14_hartley-wedding_142311.nef
DSC_0007.JPG   →  2026-03-14_hartley-wedding_142311.jpg
C0042.MP4      →  2026-03-14_hartley-wedding_150218.mp4

The ceremony ended at two. Search for hartley-wedding_14 and you see only what was shot between 2 and 3 pm, in order, with each RAW file next to its JPEG. Every name says whose photo it is and the second it was taken.

This guide shows how to batch rename files by date and client like this, for a whole shoot at once. It uses free tools on Windows and Mac and needs no coding: the longest command is one line you copy, paste and edit. It is written for photographers, agencies and office teams who handle other people’s files.

The short answer

1. Copy the shoot to a working folder, with one folder per client.
2. Rename by the date taken stored inside each photo (EXIF DateTimeOriginal), never by the file’s created or modified date.
3. Use PowerToys PowerRename on Windows or the free ExifTool on Windows and Mac. Preview the new names, then apply.

The rest of this guide covers each step, the commands to copy and the mistakes that cost people their originals.

Step 1: Decide the naming pattern before you rename anything

Pick one pattern and use it for every client. A pattern that works for most teams puts the date first, then the client, then a part that keeps names unique:

2026-03-14_hartley-wedding_142305.jpg

Underscores separate the parts and hyphens join words inside a part. That way a person, a spreadsheet or a script can split the name back into date, client and number.

• Never put a colon in the time. Windows does not allow < > : " / \ | ? * in file names, so 14:23:05 has to become 142305.
• Avoid dates like 14-03-2026 or 03-14-2026. They sort by day or month, not by year, and readers in other countries read them differently.
• Keep names short. Windows paths are limited to 260 characters by default, and deep client folders use up that budget quickly.

Step 2: Use the date the photo was taken, not the file date

Every photo has several dates, and only one of them is reliable. Your computer shows the file dates by default, which is why renaming by “Date created” so often gives wrong results.

In Windows File Explorer, right-click the column headers in Details view and add “Date taken”. On a Mac, open the photo in Preview, choose Tools, then Show Inspector, and look at the EXIF tab. If the date taken is empty, the file was probably sent through a messaging app or screenshotted, which strips the metadata.

Check the camera clock before you trust the dates. If a camera was an hour off after a daylight-saving change, or two cameras disagreed, fix the dates first. ExifTool (option B below) can shift them in one command; this example moves every date in the folder forward one hour and keeps a backup copy of each file:

exiftool "-AllDates+=1" "D:\Shoots\hartley-wedding"

Step 3: Work on a copy, one shoot at a time

A batch rename touches every file at once. Before you start, copy the shoot to a working folder and keep the card or the backup untouched until you have checked the result.

Sort files by client before you rename. The date tells you when a photo was taken, but not who it was for. If you shoot two clients on the same day, put each client’s files in their own folder first, then rename one folder at a time with that client’s name. The section on several clients in one day, further down, shows a quick way to split them.

Step 4: Pick a tool that can read the date taken

Most built-in rename features only add numbers, or use the file date. Here is what each common tool can do:

Bulk Rename Utility reads the date taken through its Auto Date panel with the type set to Taken (Original), but only after you tick the option to extract EXIF data, which is off by default because it is slow. Adobe Bridge renames in the order the files are sorted on screen, so sort by Date Created before you start.

If your photos are already in a Lightroom Classic catalog, rename them inside Lightroom (Library, then Rename Photos). Renaming files outside Lightroom breaks the catalog’s links, and every photo shows up as missing.

Option A: PowerRename on Windows

PowerRename is part of Microsoft PowerToys, a free download from Microsoft. Recent versions can read photo metadata, including the date taken.

1. Install or update PowerToys, then select all photos in the client folder in File Explorer.
2. Right-click and choose Rename with PowerRename.
3. In Search for, enter ^.*$ and tick Use regular expressions. This matches the whole name.
4. Choose the EXIF option for date and time values, and set Apply to Filename only so the extension stays.
5. Leave Enumerate items off and enter the pattern below in Replace with.
6. Read the preview column. When every new name looks right, click Apply.

$DATE_TAKEN_YYYY-$DATE_TAKEN_MM-$DATE_TAKEN_DD_hartley-wedding_$DATE_TAKEN_HH$DATE_TAKEN_mm$DATE_TAKEN_SS

That gives names like 2026-03-14_hartley-wedding_142305.jpg, the same pattern as the ExifTool method below. If the result is wrong, press Ctrl+Z in File Explorer straight away to undo the rename.

• Do not add a counter such as ${} to this pattern. In current versions, PowerRename works out where the counter goes before it fills in the date patterns, so the counter can land in the wrong place or the rename can fail.
• Two photos taken in the same second, such as a burst, cannot both get the same name. One of them will not be renamed; rename those with ExifTool, which adds -1, -2 automatically.
• The plain $YYYY, $MM and $DD patterns use the file creation date, not the date taken. For photos, always use the $DATE_TAKEN versions.

Option B: ExifTool on Windows and Mac

ExifTool is a free command-line program that has been the standard for photo metadata for over 20 years. It reads the date taken from JPEG, HEIC, RAW and video files, and it can rename thousands of files in seconds. It looks technical, but you only need two commands.

First, a dry run. The testname option prints what each file would be called without renaming anything:

exiftool -d "%Y-%m-%d_hartley-wedding_%H%M%S%%-c.%%e" "-testname<DateTimeOriginal" "D:\Shoots\hartley-wedding"

When the output looks right, run the same command with filename instead of testname:

exiftool -d "%Y-%m-%d_hartley-wedding_%H%M%S%%-c.%%e" "-filename<DateTimeOriginal" "D:\Shoots\hartley-wedding"

Using the time taken instead of a counter has one big advantage: the name does not depend on the order of the files. A RAW file and its JPEG get the same name with different extensions, so they stay paired. And if you add files later, nothing already renamed has to change.

• On a Mac, use a path like ~/Pictures/Shoots/hartley-wedding. Double quotes work in Terminal, Command Prompt and PowerShell.
• Add -r before the folder path to include subfolders.
• In a Windows .bat file, double every % sign.
• Files without a date taken are skipped and reported. You can fall back to other dates by repeating the option: "-filename<FileModifyDate" "-filename<CreateDate" "-filename<DateTimeOriginal". The last date that exists wins.

ExifTool can also sort files into dated folders. New folders are created in the folder your terminal is in, not next to the photos, so open the terminal inside the client folder first. On Windows, type cmd in the File Explorer address bar of that folder and press Enter. On a Mac, type cd and a space in Terminal, drag the folder onto the window and press Return. Then run this; the dot means the current folder:

exiftool -d "%Y-%m-%d" "-directory<DateTimeOriginal" .

Several clients on the same day

When one card holds three sessions, the date alone cannot separate the clients, but the time can. Write down when each session started and ended. Your calendar already has this:

On Windows, open the card’s folder in File Explorer, switch to Details view and sort by Date taken. Click the first photo of a session, Shift-click the last one and drag the selection into that client’s folder. A long gap in the times usually marks the break between sessions.

On a Mac, Finder cannot sort by date taken, so let ExifTool split the shoot into one folder per hour, then drag each hour folder to the right client. Open the terminal in the card’s folder as described above and run:

exiftool -d "%Y-%m-%d_%Hh" "-directory<DateTimeOriginal" .

That creates folders such as 2026-03-14_13h. Check the hour in which one session ended and the next began, since it may hold photos from both clients. Once every client has their own folder, rename each folder with the steps above.

Not photos? Renaming documents and scans by date

The same search, batch rename files by date, often means invoices, contracts or scans. These have no date taken, so pick the date that actually matches what the file is:

The naming rules from step 1 still apply: year first, one spelling per client or supplier, no colons. A folder of invoices named 2026-03-31_acme-supplies_inv-1043.pdf sorts itself and answers an accountant’s question in seconds.

Step 5: Check the result before you delete anything

1. The number of files before and after is the same.
2. Spot-check ten names against the date taken shown in File Explorer or Preview.
3. Look for files that were not renamed; they had no date taken and need a decision.
4. RAW and JPEG pairs still share a name, and sidecar files such as .xmp were renamed to match.
5. The working folder is backed up before you clear the memory card.

Sidecar files deserve a note. Lightroom and other editors save edits in .xmp files next to RAW photos. A sidecar has no date taken of its own, so a date-based rename skips it and the edits get separated from the photo. Each sidecar has to be renamed to match its photo’s new name, so check for them before you start; a short script can handle the pairing.

Why this gets repetitive

Renaming one shoot takes ten minutes once you know the commands. The work that adds up is everything around it: splitting a day with three clients into the right folders, typing the client name the same way every time, fixing the camera clock, renaming videos with the photos and moving everything to the right place on the drive.

Those rules do not change from one shoot to the next, which makes them a good fit for a small program on your own computer. You drop the card’s files into one folder, and it reads the date taken, looks up the client from your schedule, renames every file and moves it into place. Nothing is uploaded, and a log records every old and new name so any rename can be reversed.