# How to Prepend Four Digit Number to Filename **URL:** \ **Category:** Support\ **Created:** [May 29, 2021, 4:15pm UTC](https://community.mp3tag.de/t/how-to-prepend-four-digit-number-to-filename/53367 "2021-05-29T16:15:59Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![B\_Dubb\_B](https://community.mp3tag.de/user_avatar/community.mp3tag.de/b_dubb_b/32/9385_2.png) [@B\_Dubb\_B](https://community.mp3tag.de/u/B_Dubb_B)\ **Post date:** [May 29, 2021, 4:15pm UTC](https://community.mp3tag.de/t/how-to-prepend-four-digit-number-to-filename/53367/1 "2021-05-29T16:15:59Z")
Hi all, I have a few hundred episodes of a podcast downloaded, and nothing will play them in order on my iPhone. Also, I just want the Filenames to be indicative of the order in which they should be played. They are in separate folders, but I want to merge the folders after I have them all numbered. Filenames are like this: Form and Function (Part 01).mp3 Form and Function (Part 02).mp3 ... Then in a different folder: Fit and Finish (Part 01).mp3 Fit and Finish (Part 02).mp3 ... I want to take the first 35 episodes in one folder and rename them like this: 0031 - Form and Function (Part 01).mp3 0032 - Form and Function (Part 02).mp3 ... Then pick up where I left off in the next folder, like this: 0066 - Fit and Finish (Part 01).mp3 0067 - Fit and Finish (Part 02).mp3 ... The reason to start at 0031 is because I have already done the first 30 manually. Is there any easy way to do this in mp3tag? I'm not good with all this stuff, so a simple and detailed explanation would be best. Any help would be greatly appreciated! ---
**Author:** ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)\ **Post date:** [May 29, 2021, 4:20pm UTC](https://community.mp3tag.de/t/how-to-prepend-four-digit-number-to-filename/53367/2 "2021-05-29T16:20:11Z")
Select the files that you want to treat. With Converter\>Tag-Tag for \_FILENAME (you probably have to type that in) try Format string: `$num($add(30,%_counter%),4) - %_filename%` ---
**Author:** ![B\_Dubb\_B](https://community.mp3tag.de/user_avatar/community.mp3tag.de/b_dubb_b/32/9385_2.png) [@B\_Dubb\_B](https://community.mp3tag.de/u/B_Dubb_B)\ **Post date:** [May 29, 2021, 4:24pm UTC](https://community.mp3tag.de/t/how-to-prepend-four-digit-number-to-filename/53367/3 "2021-05-29T16:24:57Z")
That worked perfectly. Thank you so very much! ---
**Author:** ![system](https://community.mp3tag.de/uploads/default/original/2X/c/ce7035d426cb755a7916793326d23b465222a407.png) [@system](https://community.mp3tag.de/u/system)\ **Post date:** [June 28, 2021, 4:25pm UTC](https://community.mp3tag.de/t/how-to-prepend-four-digit-number-to-filename/53367/4 "2021-06-28T16:25:54Z")
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