diff --git a/CHANGELOG.md b/CHANGELOG.md
index bfe2b1b6..b5c403af 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@
 
 * `pear`: fix component not exiting with the correct exitcode when PEAR fails.
 
+* `cutadapt`: fix `--par_quality_cutoff_r2` argument.
+
+* `cutadapt`: demultiplexing is now disabled by default. It can be re-enabled by using `demultiplex_mode`.
+
 # biobox 0.1.0
 
 ## BREAKING CHANGES
@@ -12,6 +16,7 @@
   Viash 0.9.0 in order to avoid issues with the current default separator `:` unintentionally
   splitting up certain file paths.
 
+
 ## NEW FEATURES
 
 * `arriba`: Detect gene fusions from RNA-seq data (PR #1).
diff --git a/src/cutadapt/config.vsh.yaml b/src/cutadapt/config.vsh.yaml
index a62f0aa9..b315d0ce 100644
--- a/src/cutadapt/config.vsh.yaml
+++ b/src/cutadapt/config.vsh.yaml
@@ -240,6 +240,24 @@ argument_groups:
           Check both the read and its reverse complement for adapter
           matches. If match is on reverse-complemented version,
           output that one.
+  
+  ####################################################################
+  - name: "Demultiplexing options"
+    arguments:
+      - name: "--demultiplex_mode"
+        type: string
+        choices: ["single", "unique_dual", "combinatorial_dual"]
+        required: false
+        description: |
+          Enable demultiplexing and set the mode for it.
+          With mode 'unique_dual', adapters from the first and second read are used,
+          and the indexes from the reads are only used in pairs. This implies
+          --pair_adapters.
+          Enabling mode 'combinatorial_dual' allows all combinations of the sets of indexes
+          on R1 and R2. It is necessary to write each read pair to an output
+          file depending on the adapters found on both R1 and R2.
+          Mode 'single', uses indexes or barcodes located at the 5'
+          end of the R1 read (single). 
 
   ####################################################################
   - name: Read modifications
diff --git a/src/cutadapt/script.sh b/src/cutadapt/script.sh
index 5e1f9e30..20c92724 100644
--- a/src/cutadapt/script.sh
+++ b/src/cutadapt/script.sh
@@ -127,7 +127,7 @@ mod_args=$(echo \
   ${par_cut_r2:+--cut_r2 "${par_cut_r2}"} \
   ${par_nextseq_trim:+--nextseq-trim "${par_nextseq_trim}"} \
   ${par_quality_cutoff:+--quality-cutoff "${par_quality_cutoff}"} \
-  ${par_quality_cutoff_r2:+--quality-cutoff_r2 "${par_quality_cutoff_r2}"} \
+  ${par_quality_cutoff_r2:+-Q "${par_quality_cutoff_r2}"} \
   ${par_quality_base:+--quality-base "${par_quality_base}"} \
   ${par_poly_a:+--poly-a} \
   ${par_length:+--length "${par_length}"} \
@@ -196,14 +196,35 @@ else
   ext="fasta"
 fi
 
-if [ $mode = "se" ]; then
+demultiplex_mode="$par_demultiplex_mode"
+if [[ $mode == "se" ]]; then
+  if [[ "$demultiplex_mode" == "unique_dual" ]] || [[ "$demultiplex_mode" == "combinatorial_dual" ]]; then
+    echo "Demultiplexing dual indexes is not possible with single-end data."
+    exit 1
+  fi
+  prefix="trimmed_"
+  if [[ ! -z "$demultiplex_mode" ]]; then
+    prefix="{name}_"
+  fi
   output_args=$(echo \
-    --output "$output_dir/{name}_001.$ext" \
+    --output "$output_dir/${prefix}001.$ext" \
   )
 else
+  demultiplex_indicator_r1='{name}_'
+  demultiplex_indicator_r2=$demultiplex_indicator_r1
+  if [[ "$demultiplex_mode" == "combinatorial_dual" ]]; then
+    demultiplex_indicator_r1='{name1}_{name2}_'
+    demultiplex_indicator_r2='{name1}_{name2}_'
+  fi
+  prefix_r1="trimmed_"
+  prefix_r2="trimmed_"
+  if [[ ! -z "$demultiplex_mode" ]]; then
+    prefix_r1=$demultiplex_indicator_r1
+    prefix_r2=$demultiplex_indicator_r2
+  fi
   output_args=$(echo \
-    --output "$output_dir/{name}_R1_001.$ext" \
-    --paired-output "$output_dir/{name}_R2_001.$ext" \
+    --output "$output_dir/${prefix_r1}R1_001.$ext" \
+    --paired-output "$output_dir/${prefix_r2}R2_001.$ext" \
   )
 fi
 
diff --git a/src/cutadapt/test.sh b/src/cutadapt/test.sh
index eff997d7..1d6d9c18 100644
--- a/src/cutadapt/test.sh
+++ b/src/cutadapt/test.sh
@@ -1,6 +1,7 @@
 #!/bin/bash
 
 set -e
+set -eo pipefail
 
 #############################################
 # helper functions
@@ -57,6 +58,7 @@ EOF
   --adapter ADAPTER \
   --input example.fa \
   --fasta \
+  --demultiplex_mode single \
   --no_match_adapter_wildcards \
   --json
 
@@ -101,6 +103,7 @@ EOF
   --output "out_test1/*.fasta" \
   --adapter ADAPTER \
   --input example.fa \
+  --demultiplex_mode single \
   --fasta \
   --no_match_adapter_wildcards \
   --json
@@ -160,6 +163,7 @@ EOF
   --adapter AAAAA \
   --adapter_fasta adapters1.fasta \
   --adapter_fasta adapters2.fasta \
+  --demultiplex_mode single \
   --input example.fa \
   --fasta \
   --json
@@ -224,6 +228,7 @@ EOF
   --input example_R1.fastq \
   --input_r2 example_R2.fastq \
   --quality_cutoff 20 \
+  --demultiplex_mode unique_dual \
   --json \
   ---cpus 1