Basically, should I mentally decode file extension abbreviations, and thus:

Documents in PDF (in format)
Photos according to JPEG (... group)


Shall I keep it as PDF?
Could it be that document is PDF, or a PDF?

closed as unclear what you're asking by Hot Licks, choster, Nathaniel, michael_timofeev, Chenmunka Nov 26 '15 at 12:43

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  • Why do you want to "decode" it? In which sentence do you want to use them? Documents in PDF are basically not editable documents and photos in JPEG are compressed ones. – Yohann V. May 28 '15 at 8:49
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    No, all of these file formats, and they should behave similarly. You don't say "Photos according to JPEG", you say "Photos in JPEG [format]" – Vilmar May 28 '15 at 8:51
  • @YohannV. to follow your example, You can't edit that document because it's in PDF and something like You could store more files in/according to JPEG. – Dima Tisnek May 28 '15 at 8:52
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    Or, just say "PDF documents" or "JPEG images" – Catija May 28 '15 at 9:04
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    Unless being very informal I generally add a noun -- "document", "image", "file", etc -- after the acronym. This turns the acronym into an adjective, making it easier to construct your sentences. – Hot Licks May 28 '15 at 11:51

When you are talking about numeric format, and about their pros and cons, you should not try to translate literally but with understanding what this format allows.

For the two format you gave :

You could store more photos if you convert them into JPEG.

You can't edit this document because it is a PDF.

Anwering to your sentences in Alternative part:

Shall I keep it [as it] in PDF?

as it saying as it is now

Could it be that document is a PDF?

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    "convert to JPEGs" and "It's a PDF". – Catija May 28 '15 at 9:03
  • @Catija Let's say into ! – Yohann V. May 28 '15 at 9:06
  • That works, too... but you can't "convert something in" unless you're talking about a program that does the conversion for you: "Convert them in Photoshop". – Catija May 28 '15 at 9:08
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    No, you would say "I converted these photos into JPEGs using MyAwesomeSoftware." or "I converted this photo into a JPEG using MyAwesomeSoftware." – Catija May 28 '15 at 9:16
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    As a side note, I would not say "into JPEGs" – I would omit the "s". Same with other formats - "I converted these documents to PDF". Though the variant with "s" is acceptable, but not as widely used. – Vilmar May 28 '15 at 12:58

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