Strings

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append: Appends the argument to the value.
capfirst: Converts the first character of the value to uppercase.
center: Centers the value in a field of a certain width using spaces.
filesizeformat: This filter formats a numeric value as KB, MB etc. This filter can be used to display a number of bytes in a human readable format of kilo- or megabytes.
format_duration: Show a duration in hours, minutes and seconds.
format_integer: Show an integer value.
format_number: Show an integer or float.
format_price: Show a price with decimals.
insert: Prepends the argument in front of the value.
is_valid_email
length: Returns the length of the value.
ljust: Justifies the value in a field of a certain width to the left, with spaces.
log_format_stack: Escapes and formats a Javascript string with a stack trace to readable HTML.
lower: Translates the value to lower case.
normalize_email: Normalize an email address, used in the identity management.
replace_args: Replace $N placeholders in string from a list of replacement values.
rjust: Justifies the value in a field of a certain width to the right, using spaces.
split: Splits the filter value into a list of values.
stringify: Translates atoms, integers and floats to strings. The undefined value is translated to the empty string. Does not translate tuples.
to_name: Map a string to a name . That is a lowercased string with only [a-z0-9_] characters.
toc: Filter to derive a Table Of Contents from a HTML body.
tokens: Returns a list of tokens from input string, separated by the characters in the filter argument.
translate: Translates a (English) value to the current language or the given language.
trim: Removes whitespace at the start and end of a string.
truncate: Truncate a text to a maximum length.
upper: Translates the value to upper case.

Resources Filters Survey